PNO-I-98-035, on 980803:automatic Reactor Scram Occurred Due to Low Reactor Vessel Water Level.Licensee Elected to Enter Cold Shutdown to Complete Several Maint Items.Licensee Issued Press Release
| ML20236X054 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 08/04/1998 |
| From: | Rogge J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| References | |
| PNO-I-98-035, PNO-I-98-35, NUDOCS 9808070080 | |
| Download: ML20236X054 (1) | |
August 4. 1998 PJELIMDiARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENE PNO-I-98-035 N
-This preliminary notification constitutes EARLY' notice of events of POSSIBLE I
safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by Region I
- staff in King of Prussia, Pennsylvania on this date.
Facility Licensee Emeraency Classification l
New York Power _ Authority Notification of Unusual Event Fitz Patrick 1 Alert' Lycoming,New York' Site Area Emergency i
Dockets: 50-333 General Emergency X Not Applicable
Subject:
UNPLANNED REACTOR SHUTDOWN GREATER THAN 72 HOURS On August 3, 1998, at 5:27 p.m., an automatic reactor scram from 70' percent power occurred due to low reactor vessel water level. The plant was at reduced power due to the "A" condensate pump being out-of-service for maintenance. By design, the high 3ressure coolant injection (HPCI) and reactor core isolation cooling (RCIC) pumps started on low low reactor vessel water level.
Due to reactor vessel water level recovery,~only the RCIC pump injected.
During the scram, 4 control rods did not initially indicate full-in at the control room panel.
The
- control rods were subsequently verified to be full-in using the emergency plant information computer (EPIC). The lowest reactor vessel water level
-reached was 130 inches.
! The licensee's preliminary cause for the low reactor vessel water level was a feedwater system perturbation. During the restoration of the "A" condensate pump following repair, air was introduced during pump venting.
The air intrusion caused the "B" condensate booster pump to trip. The licensee continues to review the event.
The licensee has elected to enter cold shutdown to complete several maintenance items. The short forced outage is currently scheduled for approximately 4 days.
Scheduled work includes main steam isolation valve limit switch adjustments, traversing incore probe containment isolation valve replacement and repair of a leaking residual heat removal system valve.
t Thc licensee made a 1-hour Non-Emergency notification under 10CFR50.72 (b)(1)(iv) at 6:16 p.m. on August 3. 1998. At the time of the i notification, it was not clear to the licensee if HPCI had injected.
The, licensee has issued a press release.
l Recion I Public Affairs is prepared to respond to media inquiries.
lTheStateofNewYorkhasbeeninformedoftheinformationcontainedin this PN.
The information in the notification is current as of 10:30 a.m. on
'Aucust 4 1998.
Cortact:
ROGGE JOU9
\\
(610)337-5146
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9008070000 980804
PDR 14 E PNO-I-90-035
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