05000369/LER-1981-149, Forwards LER 81-149/03L-0.Detailed Event Analysis Encl

Forwards LER 81-149/03L-0.Detailed Event Analysis Encl

ML20031C496
Person / Time
Site:	McGuire
Issue date:	09/25/1981
From:	Lavallee B DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20031C498	List: 05000369/LER-1981-149, Forwards LER 81-149/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-149-03, /03L-0:on 810828,w/fire Protection Sys Jockey Pumps Unable to Maintain Normal Header Pressure,Fire Pump a Would Not Start.Caused by Antipump Controls Receiving Both Open & Close Signals.Pressure Switch Reset
References
NUDOCS 8110070209
Download: ML20031C496 (3)

LER-1981-149, Forwards LER 81-149/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3691981149R00 - NRC Website

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DUKE POWER COM" JY Powsm Dutt.ntwo C.asa4a 42n Sours Catracy BrazzT,Cnaurnita.N.

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Mr PasseptwT September 25, 1981

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Mr. J. P. O'Reilly, Director

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McGuire Nuclear Station Unit 1

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Re:

Docket No. 50-369

Dear Mr. O'Reilly:

/81-149. This report t

Please find attached Reportable Occurrence Report RO-369 Shall Be Operable concerns T.S.3.7.10.1, "The Pire Suppression Water SystemThis With:

pact to the haalth and safety of the public.

truly yours, O a

V LS -

ws William O. Parker, Jr.

PBN/smh Attachments Mr. Bill Lavallee Nuclear Safety Analysis Center Director Office of Management and Program Analysis Post Office Box 10412 cc:

U. S. Nuclear Regulatory Commission Palo Alto, California 94303 l

Washington, D. C.

20555 Ms. M. J. Graham Resident Inspector-NRC p

.McGuire Nuclear Station stll 3

8110070209 810925 PDR ADOCK 05000369 S

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McGU1RE NUCLEAR STATION REPORTABLE OCCURRENCE REPORT NUMBER: 81-149 REPORT DATE:

September 25, 1981 OCCURRENCE DATE: August 28, 1981 FACILITY: McCuire Unit 13 Cornelius, N.C.

IDENTIFICATION OF OCCURRENCE: Main Fire Pump A would not start in the manual or automatic mode.

CONDITION PRIOR TO OCCURRENCE: Mode 2. Start-up-DESCRIPTION OF OCCURRENCE: On August 28, 1981, construction personnel on Unit 2 began using the fire protection system (RF) header water and the fire protection jockey pumps could not maintain header pressure at 120 psig. Main fire pump A auto-;

matica11y started on a decreasing header pressure of 95 peig and increased the fire header pressure to 150 peig (normel). After a few minutes operations per-sonnel thought that the jockey pumps could maintain the hasder pressure so they stopped fire pump A.

Each fire pump is equipped with a.self contained pressure regulating valve on the discharge of the pump which prevents overpressurization of the fire header when.

the pump is operating. It was necessary for the. control room operator to hold. fire pump A STOP pushbutton depressed long-enough to allow the fire pump regulator valve to go fully closed so the jockey pumps would have sufficient time to pressuriza the fire header. Holding the STOP button depressed prevented fire pump A from automatically starting before the jockey pumps could maintain the fire header prersure and reset the fire pump A auto start low header pressure switch. The jockey pumps could not maintain header pressure, however, so the fire pump A auto start signal did not reset. The pump breaker-trip signal was also maintained be-l cause the operator was holding the pump A STOP button depressed at the same time.

The main fire pump A breaker is equipped with an anti-pumping coil and contacts which prevent the breaker from cycling open and closed when two opposite signals (open and close) are received simultaneously. Main fire pump B was out of service for repairs and fire pump C was isolated from the fire header for the performance of the periodic test' "RF System Flow Test".

Sinco fire pump A could not be started eithar mammily or automatically, it. was declared inoperable. This was reportable pursuant to Technical Specification 3.7.10,1.

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APPARENT CAUSE_OF OCCURRENCE: The anti-pumping controla in the fire pump breaker prevented the breaker from operating when open and close signals were received siraltaneously. This prevented the pump from being restarted until the auto start signal from the low header pressure switch was reset.

_A_NALYSIS OF OCCURRENCE,: When A fire pump is stopped it takea about ten seconds for its regulator valve to fully close. During this time the jockey pumps may not be able to enintain fire header pressure above the auto start setpoint on the low header pressure switch, cauaing fire rump A to restart. The control room operators hold the fire pump STOP button depressed until fire header pressure is greater than 95 psig and the pressure switch is reset.

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Rnport Number 81-149 P.sge 2 ssure greater than d

the jockey pumps could not maintain hea er pre A was maintained. Since this occur-P pushbutton the anti-pumping coil S5 psig and the auto start signal for fire pump In this incident, red while the operator was depressing the STO7.5 HK) prevented the breaker fro and contacts in the pump breaker (ITE Type d the STOP pushbutton.

ating even when the operator no longer depresse When the breaker

/ NED SER 46-81.

This is a generic type problem identified in NSAC Iis locked ou TW f its condition.

from the breaker cabinet ways to resee the psamp breaker are to resetanother fire pump or to remo without depressing the STOP button.

and reinstail them fire psump C to Af ter about ten minutes Operations personnel were able td realignAfter t fire the fire header and start it.

Fire pump A was then declared oper-pump A was manually started and pump C stopped.

able.

Even though fire pump A was inoperable for about 15 m!nutes, th i

mal fire header jockey pumps were operable even though they could not mainta n nor

SAFETY ANALYSIS

There were no Fire pump C was also realigned to the header and started.

The health fires during the incident so the fire protection system was not needed.

pressure.

and safety of the public were not affected by this incident.

Operations personnel aligned fire. pump C to the fire heade The header pressure increased to about 150 psig and-reset thL low

CORRECTIVE ACTION

Fire pump A was started and declared operable.

started it.

er pressure switch.

McGuire Ma several pumps. whose braalrars are equipped logic as the fire pumps.

The generic problem of locked out and operation of these anti-pumping co::trols. circuit breakers not giving Company.

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