PNO-II-97-026A, on 970504,RCS Was at 230 Degrees F and 277 Psig.Investigation Revealed That Letdown Storage Tank Level Instrumentation Ref Leg Found to Be About 45 Inches Low, Resulting in False High Indicated Level
| ML16139A505 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 05/05/1997 |
| From: | Christensen C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| References | |
| FACA, PNO-II-97-026A, PNO-II-97-26A, NUDOCS 9705060178 | |
| Download: ML16139A505 (2) | |
0 CATEGORY*
REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION-NBR:9705060178 DOC.DATE: 97/05/05 NOTARIZED: NO DOCKET #
FACIL:50-287 Oconee Nuclear Station, Unit 3, Duke Power Co.
05000287 AUTH.NAME AUTHOR AFFILIATION CHRISTENSEN,C.
Region 2 (Post 820201)
RECIP.NAME RECIPIENT AFFILIATION
SUBJECT:
PNO-II-97-026A:on 970504,degraded HPI pumps update made.NRC Region II Incident Response Ctr,continuously staffed in monitoring phase.State of SC notified.
C DISTRIBUTION CODE: IE34F COPIES RECEIVED:LTR 0 ENCL SIZE:
A TITLE: 50 Docket & Vendors PNO/Non-Routine Event/Safeguards Event (PN)
T NOTES:
E RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL G
INTERNAL: ACRS I
LECENT-ER 1
O NRR/DISP/PIPB 1
NRR/DRPM/PERB 1
NUDOCS FULL TXT 1
OE DIR 1
RES/DET/EIB 1
RES/DRA 1
RES/DRA/DEPY 1
RES/DST 1
RES/DST DEPY 1
RES/RPHEB 1
R -2)
VTTC V 1
Al 1
RRGN FILE/01T 1
EXTERNAL: LITCO BRYCE,J H 1
NOAC NRC PDR
]1 D
0 C
U M
E NOTE TO ALL "RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE.
TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD) ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED: LTTR ENCL 16 May 5,
1997 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-II-97-026A This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by Region II staff in Atlanta, Georgia on this date.
Facility Licensee Emergency Classification Duke Power Co.
X Notification of Unusual Event Oconee 3 Alert SenecaSouth Carolina Site Area Emergency Dockets: 50-287 General Emergency Not Applicable
Subject:
DEGRADED HIGH PRESSURE INJECTION PUMPS -
UPDATE licensee continued maintaining stable reactor coolant system (RCS) conditions with one reactor coolant pump and one decay heat removal pump in operation. At about 10:30 a.m. on May 4, 1997 the RCS was at 230 degrees F and 277 psig. Investigation revealed that the letdown storage tank level instrumentation reference leg was found to be about 45 inches low which resulted in a false high indicated level.
Following a safety committee review of special system procedures and contingency plans, the licensee filled, vented, and flushed the suction piping for the 3C HPI pump. At about 11:20 a.m. on May 4, 1997 the C pump was started and is operating normally. At 12:15 p.m. the licensee recommended a normal cooldown and placed the RCS in cold shutdown at about 2:00 p.m.
The NRC Region II Incident Response Center has been continuously staffed in:the Monitoring Phase. The NRC resident inspectors, augmented by a Region II specialist and manager, have provided 24-hour inspection of onsite activities including safety committee meetings, control room operations, Technical Support Center activities, and equipment observations.
This information is up to date as of 2:00 p.m., May 4, 1997.
The State of South Carolina has been notified.
Contact:
C. CHRISTENSEN (404)562-4605 9705060178 970505 PDR I&E PNO-II-97-026A PDR