diff --git a/app/workers/openalex_collector.py b/app/workers/openalex_collector.py
index f7b6e35..a52c867 100644
--- a/app/workers/openalex_collector.py
+++ b/app/workers/openalex_collector.py
@@ -52,6 +52,18 @@ _KEYWORDS = (
     "fatigue life assessment",
 )
 
+# 도메인 직결 저널 ISSN 시드(OpenAlex sources 실측 확인) — 키워드 매칭 누락분까지 전수 커버.
+# KR 안전/가스/기계 + JP 고압. KR/JP 관심 = OpenAlex 깨끗한 API 로 직접(KoreaScience/J-STAGE 전용
+# 스크래퍼 불요 — Phase-1 메타는 OpenAlex 와 중복, 전용 수집기의 유니크 가치=무료 전문 PDF=Phase-2).
+_JOURNAL_ISSNS = (
+    ("한국안전학회지", "1738-3803"),
+    ("한국가스학회지", "1226-8402"),
+    ("대한기계학회논문집 A", "1226-4873"),
+    ("대한기계학회논문집 B", "1226-4881"),
+    ("KSME International J.", "1226-4865"),
+    ("Review of High Pressure Sci&Tech (JP)", "0917-639X"),
+)
+
 _RUN_CAP = 60           # 1회 run 신규 적재 상한(임베드 큐 보호). bulk 시 해제.
 _PER_PAGE = 50
 _MAX_PAGES_PER_KW = 4   # 키워드당 최대 페이지(증분이라 보통 1페이지에 워터마크 도달)
@@ -145,6 +157,20 @@ def build_filter(keyword: str, from_date: str | None = None) -> str:
     return f
 
 
+def build_issn_filter(issn: str, from_date: str | None = None) -> str:
+    f = f"primary_location.source.issn:{issn}"
+    if from_date:
+        f += f",from_publication_date:{from_date}"
+    return f
+
+
+def _seeds() -> list[tuple[str, str, str]]:
+    """수집 시드 = (라벨, 워터마크키, 종류). 도메인 저널 ISSN 우선(cap 우선권) → 키워드."""
+    s: list[tuple[str, str, str]] = [(label, issn, "issn") for label, issn in _JOURNAL_ISSNS]
+    s += [(kw, kw, "kw") for kw in _KEYWORDS]
+    return s
+
+
 # ───────────────────────── 적재 (DB — PR3 라이브 검증) ─────────────────────────
 
 def _build_paper_meta(source: NewsSource, w: OpenAlexWork) -> dict:
@@ -296,13 +322,14 @@ async def run(bulk: bool = False, limit: int = 0) -> None:
     async with httpx.AsyncClient(
         timeout=30.0, headers={"User-Agent": CRAWL_UA}, follow_redirects=True
     ) as client:
-        for keyword in _KEYWORDS:
+        for label, wm_key, kind in _seeds():
             if inserted >= run_cap:
                 break
             async with async_session() as session:
                 src = await session.get(NewsSource, source_id)
-                watermark = None if bulk else _watermark(src, keyword)
-            filter_str = build_filter(keyword, watermark)
+                watermark = None if bulk else _watermark(src, wm_key)
+            filter_str = (build_issn_filter(wm_key, watermark) if kind == "issn"
+                          else build_filter(wm_key, watermark))
             newest: str | None = None
             cursor = "*"
             max_pages = (10**6 if bulk else _MAX_PAGES_PER_KW)
@@ -334,10 +361,10 @@ async def run(bulk: bool = False, limit: int = 0) -> None:
                 if newest:
                     async with async_session() as session:
                         src = await session.get(NewsSource, source_id)
-                        _set_watermark(src, keyword, newest)
+                        _set_watermark(src, wm_key, newest)
                         await session.commit()
             except (httpx.HTTPError, FeedError, ValueError) as e:
-                msg = f"[{keyword}] {e or repr(e)}"
+                msg = f"[{label}] {e or repr(e)}"
                 logger.error(f"[openalex] {msg}")
                 failures.append(msg)
 
@@ -351,7 +378,7 @@ async def run(bulk: bool = False, limit: int = 0) -> None:
 
     deferred = "" if inserted < run_cap else f" (cap {run_cap} 도달 — 잔여 다음 run 이월)"
     logger.info(
-        f"[openalex] {len(_KEYWORDS)}개 키워드 스캔 {seen}건 → 신규 {inserted}건{deferred}"
+        f"[openalex] {len(_seeds())}개 시드(ISSN+키워드) 스캔 {seen}건 → 신규 {inserted}건{deferred}"
         + (f" / 실패 {len(failures)}건" if failures else "")
     )
 
diff --git a/tests/test_openalex_collector_units.py b/tests/test_openalex_collector_units.py
index 5e17479..afee7b0 100644
--- a/tests/test_openalex_collector_units.py
+++ b/tests/test_openalex_collector_units.py
@@ -11,7 +11,9 @@ sys.path.insert(0, str(Path(__file__).parent.parent / "app"))
 
 from workers.openalex_collector import (  # noqa: E402
     _reconstruct_abstract,
+    _seeds,
     build_filter,
+    build_issn_filter,
     license_meta,
     parse_openalex_works,
 )
@@ -90,3 +92,15 @@ def test_build_filter():
     assert build_filter("process safety") == "title_and_abstract.search:process safety"
     assert build_filter("process safety", "2026-06-01") == \
         "title_and_abstract.search:process safety,from_publication_date:2026-06-01"
+
+
+# ─── PR6: ISSN 소스 시드 (KR/JP 안전 저널 직접 커버) ───
+
+def test_build_issn_filter_and_seeds():
+    assert build_issn_filter("1738-3803") == "primary_location.source.issn:1738-3803"
+    assert build_issn_filter("1738-3803", "2026-01-01") == \
+        "primary_location.source.issn:1738-3803,from_publication_date:2026-01-01"
+    seeds = _seeds()
+    kinds = [k for _, _, k in seeds]
+    assert kinds[0] == "issn"  # ISSN 시드가 키워드보다 먼저(cap 우선권)
+    assert any(v == "1738-3803" and k == "issn" for _, v, k in seeds)  # 한국안전학회지 포함