ML19317G107

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RO-76-04:on 760405,calibr Check Revealed That Four Transmitters Drifted Beyond Tech Spec Requirement.Cause Unknown.Rcs Pressure Trip Setpoints Will Be Set More Conservatively at 10 Psi
ML19317G107
Person / Time
Site: Rancho Seco
Issue date: 04/15/1976
From: Colombo R, Eisenhuth F
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
Shared Package
ML19317G103 List:
References
NUDOCS 8002210797
Download: ML19317G107 (1)


Text

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UCENSEE EVENT REPORT CONTROL ELOL..t l

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l (PLEASE PRINT ALL REQUIRED INFORMATION)

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We' uCENsE NuMoER O1 l cI Al Rl Sl Sl1 l l 0 l 0 l-l 0l 0l0 l 0 l 0 l-l 0l 0l l4l1 l1l1l1l l0l1l 7 d0 14 15 25 26 30 31 32

"'Yy foe c4TEcoRY T

coCxET NUMBER EVENT DATE REPORT DATE O 1 CON'T l p l 1l J lL l l 0 l 5 l 0l-l 0l 3l 1l 2l l 0 l 4 l 0l 5l 7l 6l l0 l 4 lll 5l 7l 6l 7.

8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION HE lOn April 5,1976, a calibration check was made on tihe RPS pressure transmitters. All l 7 89 60.

EE If ur transmitters were found to have drif ted beyond their required acc.uracy; a low lg 7 89 80 gg l pressure reactor trip would not have occurred at the specified setpoint. Two previous l 7 89 80 UE.l occurrences of this type have been reported.

(R0 76-4) l-7 89 80 -

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7 89 e0 :

YEo'E So"Os' couPoNENT CODE ACR R VoLATCN O

lI l A l J l Il Nl SlT l R jU l l Nl l Wl 1l2 l0 l lYl 7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION Q lThe four Veritrak Products Model 59 PR 443-7050 pressure transmitters experienced l

7 89 80.

DIE ldrif t causing three to read low and one high, all outside of specifications. RCS l-7 89 80 EE loressure trin setroints will be set 10 osi more conservative.

l' FAC4JTV METHOD OF STATUS

% POWER OTHER STATUS OGCOVERY OSCOVERY DESCRIPTCN

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7 8 9

10 12 13 44 45 46 80 0

0F E ASE AMOUNT OF ACTNITY LOCATON OF RELEASE BE Izl LzJ l

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l 7 8 9

10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTON i

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7 89 11 12 13 80 PERSONNEL INJUAIES NUMBER CESCRIPT;CN

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7 89 11 80 OFFSITE CONSEQUENCES

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4A 7 89 80 - -.

LOSS OR DAMAGE TO FAC:UTY TYPE DESCRiPTON g] y l

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7 89 10 80 PUBUCITY RE l Sacramento Union and Sacrattento Bee notified April 8,1976.

l 7 89 80

ADDITIONAL FACTORS N

l The drif t was discovered by a biweekly check of the transmitters for drif t, which willl 00 80 -

be continued. Reactor vendor and NRC discussing possibility of permittin;; more

!Inserwent error in the RPS orossure trio setpoints.

l 7 89 eo NAME: R.W. Colombo /F.T.Eisenhuth E.(916) 452-3211 p

goozal 777

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