ML18139B309

LER 81-008/03L-0:on 810410,process Vent Radiation Monitor Found Inoperable.Caused by Broken Pump Drive Belt Due to Misalignment.Drive Belt Replaced & Radiation Monitor Operability Verified

ML18139B309
Person / Time
Site:	Surry
Issue date:	05/08/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B307	List: ML18139B306 ML18139B308 ML18139B309
References
LER-81-008-03L, LER-81-8-3L, NUDOCS 8105150296
Download: ML18139B309 (2)

Text

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I On April 1-0,1981, the Process Vent radiation monitor was found inoperable due tn a broken pump drive belt. A temporary repair to the failed belt was made, Approxirnateiy CIII] sixteen hours later, the drive belt failed again. This is contrary to T.S.-3.11.B.5.l-ITTIJ b and is reportable per T.S-6.6.2.b(4). An independent H.P. accountability sampler

[ill] verified that the normal release from the Process Vent system was within Tech. Spec.

[ill] limits. Therefore, the health and safety of the public were not affected.

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lJ))J J The exact cause cannot be determined, however, misalignment is Suspected_ Ea] Jawing CIII] the second event, the dr_ive belt was replaced with a new belt and thl:! Rad1atinn Monitor verified operable.

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ATTACHMENT i e

SURRY POw'ER STATION, UNIT 1 DOCKET NO: 50-280 REPORT NO: 81-008/03L-O EVENT DATE: 04-10-81 TITLE OF EVENT: RADIATION MONITOU (Gw~lOl/102) PUNP FAILURE

1. DESCRIPTION OF EVENT:

On April 10, 1981, the Process Vent radiation moni'tor, RM-GW-101/102, was f_ound inoperable due to a broken pump drive belt. Due to a lack of readily available drive belts, a temporary repair to the failed belt was made .

.Approximately sixteen hours later, the drive belt failed again, This is contrary to Technical Speciti~ation 3.11.B,5.b and is reportable per Technical Specification 6*:6, 2. b(4).

2. PROBABLE CONSEQUENCES.AND STATUS OF REDUNDANT SYSTEMS:

The Process Vent System is monitored by RM-GW~lOl, 102 and the Health Physics accountability sampler. The H.P. accountability sampler provides cumulative samples. The HP accountability sample," that was analyzed :ifter this occurrence, indicated that the releases made during the event were within allowable Tech. Spec. limits. Therefore, the health and safety of the public were not affected.

3. CAUSE:

The exact cause cannot be determined, however, misalignment is suspected.

4. IMMEDIATE CORRECTIVE ACTION:

For both events, the immediate corrective action was to carry out the actions setforth in abnormal procedure No, 5.16, e.g. input source isolation,

5. SUBSEQL'ENT CORRECTIVE ACTION:

Following the second event, the drive belt was replaced with a new belt and the Radiation Monitor verified operable.

6. ACTION TAKEN TO PREVENT RECURRENCE:

Since craft personnel are already aware of the consequences of misalignment, no additional action is deemed necessary.

• 7. GENERIC IMPLICATIONS:

This appears to be an isolated event, therefore not generic,