ML18079A209

LER 79-032/03L-0 on 790330:during Normal Operation,Auxiliary Typewriter Started Printing Meaningless Messages.Caused by Failed Solid State Component Circuit Board in Typewriter Logic Control Cabinet.Component Board Replaced

ML18079A209
Person / Time
Site:	Salem
Issue date:	04/30/1979
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18079A208	List: ML18079A207 ML18079A209
References
LER-79-032-03L, LER-79-32-3L, NUDOCS 7905040371
Download: ML18079A209 (3)

Text

Report Number: 79-32/03L Report Date: 4/30/79 Occurrence Date: 3/30/79 Facility: Salem Generating Station _

Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Auxiliary Alarm Typewriter Inoperable making the Axial Flux Differential Monitor and Containment Sump Level Monitoring Systems. Inoperable CONDITIONS PRIOR TO OCCURRENCE:

Operational Moqe 1 Reactor Power 100%

DESCRIPTION OF OCCURRENCE:

At 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br />, the auxiliary annunciator typewriter logic failed cau*sing the typewriter to print meaningless messages. This typewriter is used to monitor axial flux difference values and stop-start times of the con-tainment sump pumps for reactor coolant leak detection. The Action Statement for Technical Specification 3.4.6.l and surveillance requirement 4.2.1.1.b for T/S 3.2.1 were implemented. At 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br />, the typewriter logic circuit was repaired and tested* satisfactory. The typewriter was returned to service and the surveillance and Action Statements were

• terminated.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this occurrence was a failed solid state component circuit board in the typewriter logic control cabinet.

ANALYSIS OF OCCURRENCE:

Surveillance Requirement 4.2.1.1.b requires that monitoring and logging the indicated axial flux difference for each operable excore channel at least once per hour for the first 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and at least once per 30 minutes thereafter, when the axial flux difference monitor alarm is inoperable. T/S 3.4.6.1 requires that with only two of the three required leakage detection systems operable, operation may continue for up to 30 days provided grab samples of the containment atmosphere are obtained and analyzed at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> when the required gaseous and/or particulate radioactivity monitoring system is inoperable; otherwise, be in at least hot standby within the next six hours and in cold shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. The logic circuit was repaired and the typewriter was returned to service within four hours.

Normal operations continued with the required surveillance being per-formed.

LER 79-32/03L CORRECTIVE ACTION:

The failed component circuit board was replaced with a spare board and the typewriter was satisfactorily tested prior to returning to service.

FAILURE DATA:

Solid State Component Circuit Board Mode RA849A Manufacturer: Rochester Instrument Systems, Inc.

Prepared By A *. w. Kapple Manager - 7 Salem Generating Station SORC Meeting No. 30-79

., NRC.f.'ORM 366

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., ' ,. LICENSEE EVENT REPORT e U.S. NUCLEAR REGULATURY COMMISSION CONTROL BLOCK: I 1 6 10 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION I rIEJ 7 8 IN 9

!J I s I G Is I 1 IG)l o I oI - I o Io I oI o I o I - I o I o IG)I 4 I 1 I 1 I 1 I 1 101 I I© LICENSE!: COOE 14 . 15 . LICENSE NUMBER 25 26 LICENSE TYPE ;JO 57 CAT 58 CON'T

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REPORT CATE 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES@

[]]II I During normal operation, the aux. annunciator typewriter started print-1

[]]]]. ing meaningless messages. This typewriter is used to monitor-axial flux difference values and containment sump pump stop-start time for RCS leak detection. T/S Action Statements for 3.4.6.1 and 3.2.1 were implemented. Within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, the typewriter was repaired and returned

[§]!] I to service at which time the Action Statements were terminated. This

[]]!] I is the first occurrence of this type. I 7 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE cooE COOE SUBCOOE COMPONENT COOE suBcooE suacooE (ITI]

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SEQUEN'TIAL OCCURRENCE REPORT REVISION

~ REPORT NO. COOE TYPE NC.

w LER,RO LVENT YEAR

~ REPORT NUMBER I I I 7 9 -I I I o 13 I 2 I I/I I oI 3 I l.=l L.oJ 21 22 23 24 26 27 28 29 30 31, 32 ACTION FUTURE EFFECT SHUTOOWN t.:::\ ATTACHMENT NPRQ.4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOO HOURS ~ SUBMITTEO FORM ::iUB. SUPPLIER MANUFACTURER UJ@~@ W@ L..!1* Io 10 Io I 01 L..!.1@ ~@ ~@) IR I 313 I 5 I@

33 34 35 36 . 37 40 41 42 . 43 44 47 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS @

(]]]] I This occurrence was caused by a failed solid state component circuit IJJJJ board in the typewriter logic control cabinet. The component board was1 u:m replaced with a spare board.

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IJEl 1 a g ao FACILITY

• ljQ\ METHOD OF STATUS  % POWER OTHER STATUS \::;J OISCOVERY DISCOVERY OESCRIPTION @

IJJI] ~@ 111 o I ol@I N/A I lLJ@I 0Eerator Observation I 7 B 9 10 12 1'3 44 45 46 80 ACTIVITY CONTENT ~

FIELEASEO OF RELEASE AMOUNT OF ACTIVITY l.OCATION OF RELEASE @

ITITJ 7 8

~@ L!J@I 9 10 11 N/A 44 45 NLA ao PERSONNEL EXPOSURES ~

NUMBER A TYPE~ DESCRIPTION

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DESCRIPTION~

ITJI] I ol ol ol@).______. ___N..........A...__________________________________________.

NUMBER 7 8 9 11 12 so LOSS OF OR OAMAGE TO FACI I.ITV '43\

TYPE DESCRIPTION '.::.::J

[!JI] W@ . NA 7 8 9 10 so PUBLICITY C\ NRC use ONLY ISSUEDC\ OESCRIPTlON ~.

JI[§] Lzj~I N/A I! l l l l ! l l l !!J 1 s 9 10 I 68 69 ea NAME OF PREP.t.RER--~--A_._w_._K_a_,,p'-"p_l_e___ PHONE: (609)365-7000 Sale:!l. Ext.

628