ML17325A026
| ML17325A026 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 04/03/1987 |
| From: | Will Smith INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8704070433 | |
| Download: ML17325A026 (3) | |
Text
REGULATO Y INFORMATION DISTRIBUTION SYSTEM (RIDS)
" ACCESSIO'N NBR;8704070433 DOC ~ DATE; 87/04/03 NOTARIZED! NO, DOCKET ¹ FACILt50"316 Donal d C ~
Cook
<vucl ear Power Pl anti Uni t 2i Indiana 8
05000316 AUTH INANE AUTHOR AFFILIATION
'MITrie W ~ G ~
Indiana 8 Michigan Electric Co.
REC IP ~ NAME RECIPIhl<T AFFILIATION Document Control Branch (Document. Control Desk)
SUBJECT:
ROron 870304~pressurizer PORV NRV 152 automatically opened to relieve-greatly increased, RCS pressure. Caused by instrument tolerance stack~up resulting in actuation at indicated 385 psig on pressure channel being monitored.
DISTRIBUTION CODE!
IE22D COPIES RECEIVED! LTR ENCL SIZE:
TITLE! 50'3 Licensee Event deport (LER)r Incident Rptr etc'OTES:
RECIPIENT ID CODE/NAME PD3 3
LA A'I(GINGTONsD INTERNAL! ACRS MICHELSON ACRS KiYLIE AEOD/DSP/ROAB NRR/ADT NRR/DEST/ADS NRR/DEST/ELB NRR/DEST/MEB NRR/DEST/PSB NRR/DEST/SGB NRR/DLPQ/GAB NRR/DREP/EPB NRR AS/ILR8 EG FI 02 RGN3 F ILt.
01
.COPIES LTTR ENCL 1
1 1
1 1
1 2
1 1
0 1
1
,1 1
l 1
1 1
1 1
1 1
1 1
1 1
1 RECIPIENT ID CODE/NAME PD3 3
PD ACRS MOELLER AEOD/DOA AEOD/DSP/TAPB NRR/DEST/ADE NRR/DEST/CEd NRR/DEST/ICSB NRR/DEST/MTB
,NRR/DEST/RSU NRR/DLPQ/HFB NRR/DOEA/EAB'RR/DREP/RAB NRR/PMAS/PTSB RES SPEISg T COPIES LTTR ENCL 1
1 1
1 1
1 1
1 11' 1
1 1
1 EXTERNAL; EGKG GHOHJM LPDR iVS1C HARRIS~ J b
5 1
1 1
H ST LOBBY HARD 1
NRC PDR 1
NSIC MAYSgG 1
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 41 ENCL 39
1 gl Amhrlccn
/electric
""" &~
WtÃDX DONALDC. COOK NUCLEAR PLANT P.O. Box 458;Bridgman, Michigan 49106 (616) 465-5901 April 3, 1987 Document Con'trol Desk United States Nuclear Regulatory Commission Washington D,C.
20555 Docket No. DPR-74 License No. 50-316 ATTN:
Mr. A. Bert Davis
Dear Mr. Davis,
This report is being submitted in accordance with Technical Specification 3.4.9.3 Action C. for Unit Two.,
During cold shutdown operation, pressurizer power operated relief valve (PORV) NRV-152 was automatically opened on March 4, 1987, at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br /> to relieve reactor coolant system (RCS) pressure which had gradually increased.
The RCS pressure decreased and NRV-152 closed when the reset pressure was reached.
During cold shutdown o'peration, loop 1 hot leg wide range RCS pressure actuates pressurizer PORV NRV-152 and loop 2 hot leg wide range RCS pressure actuates pressurizer PORV NRV-153.
The setpoint for both valves is 420 psig
+ 15 psig.
The operators were controlling RCS pressure based on loop 2 hot leg wide range pressure indication.
This indication was at approximately 385 psig when NRV-152 was actuated.
Checks of the loop 1 and 2 hot leg wide range RCS pressure instruments determined that, both were within allowable tolerances.
It is therefore concluded that this event occurred as a
result of instrument tolerance stack-up which resulted in actuation at an indicated 385 psig on the pressure channel being monitored.
8704070433 870403 PDR ADOCK 0500031' PDR
.Administrative changes are being pursued to direct operating at an RCS pressure sufficiently below the pressurizer PORV cold overpressure protection setpoint so as to prevent a repeat event.
Sincerely ~g(
W.
G. Smith, Jr.
Plant Manager BKW/pd cc:
J.
E. Dolan - AEPSC M. P. Alexich R. F. Kroeger H. B. Brugger R.
W. Jurgensen NRC Residqnt Inspector R.
C. Callen G. Charnoff, Esq.
D. Hahn Records