ML18078B234

LER 79-035/01T-0 on 790405:during Cold Shutdown,Fire Pump 2 Did Not Automatically Start When Header Pressure Dropped. Caused by Fault in Starting Control Circuit.Corrective Action Underway

ML18078B234
Person / Time
Site:	Salem
Issue date:	04/19/1979
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18078B233	List: ML18078B232 ML18078B234
References
LER-79-035-01T, LER-79-35-1T, NUDOCS 7904240407
Download: ML18078B234 (3)

Text

Report Number: 79-35/0lT Report Date: 4/19/79 Occurrence Date: 4/05/79 Facility: Salem Generating Station Public Service Electric & Gas Company Hancock's Bridge, New Jersey IDENTIFICATION OF OCCURRENCE:

Loss of Automatic Start for Diesel Fire Suppression Pumps CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 5 Reactor Power - 0%

DESCRIPTION OF OCCURRENCE:

At 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br />, with No. 1 Diesel Fire Pump out of service for planned maintenance, No. 2 Diesel Fire Pump did not start automatically when fire protection water header pressure dropped below 75 psig. A large amount of fresh water was being used to clean the main condenser tubes and water boxes in preparation for condenser outage activities. The large fresh water usage from the Fire Protection System exceeded the capacity of the pressure maintenance pump, dropping the header pressure.

An overhead annunciator in the Control Room alarmed at 65 psig header pressure and an operator was sent to the fire pump house to investigate.

Technical Specification 3.7.10.l Action b was implemented. The opera-tor started the fire pump in manual mode and restored system pressure.

At 1855 hours0.0215 days <br />0.515 hours <br />0.00307 weeks <br />7.058275e-4 months <br />, the Action Statement was terminated after three auto-matic starts verified system operability.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this occurrence was a fault in the diesel startup control circuit which resulted in sustained cranking on "A" battery. The starting control circuit should initiate alternate 10 second cranking from each battery until the diesel starts or until a 90 second time delay relay times out. When the relay times out, the starting signal is stopped and a "fail to start" trouble alarm is initiated. The operator tried to initiate a manual start using "A" battery but its depleted condition would not maintain cranking power. A manual start using "B" battery was successful.

ANALYSIS OF OCCURRENCE:

Technical Specification 3.7.10.1 Action b requires that with both fire suppression water systems ino~erable:

1. Establish a backup fire suppression water system within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

2. Submit a special report in accordance with Specification 6.9.2.

• , *~

LER 79-35/0lT The fire pump house was manned by an Equipment Operator who monitored the Fire Suppression System and operated the fire pump in manual mode as needed. The automatic initiation logic for the fire pump was tested satisfactorily and the Action Statement was terminated within 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> and 25 minutes.

CORRECTIVE ACTION:

The fire pump was running in manual control when maintenance personnel arrived to investigate the problem. The "fail to start relay was found tripped with no light indication for the cause of the relay trip.

The relay was reset and it was then discovered that the indicating lights were burned out. New bulbs were installed. A reduction in the amount of fresh water usage to within the capacity of the pressure maintenance pump allowed the batteries to charge so that three manually initiated automatic starts were performed satisfactorily. A weak cell was found in both "A" and "B" batteries and replacement batteries have been ordered. Corrective action to verify satisfactory starting sequence operation is continuing at this time.

FAILURE DATA:

Not Applicable Prepared By A. W. Kapple Manager - Salem Generating Station SORC Meeting No. 27-79

LICENSEE EVENT REPORT e U.S. NUCLEAR REGULATURY COMMISSION nOLBLOCK: ~'~-----~---__..~......___1(2) (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 IJ I s I G Is I 1 10)1 o I oI - I o Io I oI o I o I - I o I o 10)1 4 I 1 I i 11 ! i 101 I I G)

LICENSEE CODE 14 :s . LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58

~~~~ lJJ© I o I s I oI o I oI 2 I 7 I 2 !GI o I 60 61 DOCKET NUMBER 68 69 4Io I s1 7 EVENT DATE J9 74 J© I o I 4 I i 75 I 91 REPORT DATE 7 I 9 IG) 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

.lIJ I During-cold shutdown operations, with No. 1 fire pump out of service for planned maintenance, No. 2 fire pump did not automatically start when header pressure dropped to 75 psig. An overhead annunciator in control room alarmed at 65 psig and an operator was sent to the fire pump h~use to investigate. The operator initiated a manual start and returned system pressure to normal. T/S 3.7.10.l Action b was j}J2J J initiated at 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br /> and was terminated at 1855 hours0.0215 days <br />0.515 hours <br />0.00307 weeks <br />7.058275e-4 months <br /> when the auto start logic

[§))] I was tested satisfactorily. This is the first occurrence of this type.

8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUB CODE SUB CODE

[TIIj [A! B[@ ~@ l2...J@  :§! A!T I T!R I YI@ LI@ ~@

7 8 g 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION

@ LER'RO LVENTYE.A.R REPORT NO. CODE TYPE NC.

REPORT NUMBER I7 I 9I 21 22 l:=J 23 lo I 3 I sJ26 24 1.....-1 27 I o I ll 28 29 L1J 30 l.=l 31 w32 ACTION FUTURE EFFECT SHUTDOWN r::;::;,. ATTACHMENT NPRD~ PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS ~ SUBMITTED FORM  :;us. SUPPLIER MANUFACTUR!:R W@lli.J@

33 34 Ul@

35 LU 36 I o Io I o I 01 37 40 .

l:£.J@

41 U!J@

42

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

o::I]J l A fault in the startinq control circuit resulted in sustained cranking using "A" battery rather than alternate 10 second crank from A and B batteries. Corrective action to correct this problem is underway at this time.

o:EJ 7 8 g 80 FACILITY STATUS o/o POWER OTHER STATUS l3°0'

\::::;J METHOD OF DISCOVERY DISCOVERY DESCRIPTION @

~ L£.J@ I 0 I0 I 0 l@I....__N___/___A"------' ~@I Alarm a s 10 12 11 44 45 46 80 ACTi"v1TY CONTENT (:;;;\.

RELEASED OF RELEASE AMOUNT OF ACTIVITY '2_V LOCATION OF RELEASE@

G::ITIa w@ WI 1 9 10 11 N/A 44 45 N/A so PERSONNEL EXPOSURES Q..

NUMBER r::;".;\ TYPE DESCRIPTION

[QI] 1 0 l 0 I 0 lW_~ __N_../_A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ -J i 8 9 11 12 13 30 PERSONNEL INJURIES Q NUMSER DESCRIPTION~

[2:fila slo!olol@ 11 NIA

'-12~-----~~'--------------------------------.....Jzo LOSS OF OR DAMAGE TO FACILITY t4J'I TYPE DESCRIPTION V ITliJa LIJ@ N/A

~1C:-----------"--------------------------------------l g 50 PUBLICITY Q. NRC USE ONLY ISSUED a DESCRIPTION~

IIBa LzJei ------------------------------------isa N /."A.

59I I I I I I I I I I I I J 91 eo NAME OF PREPARER _ _ _ _ _A_._w_._K_a-=.p..,:p_l __e _ __ PHONE: !609)365-7000 Salei:i ~~t.

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