ML20039D304

LER 81-064/03X-2:on 811012 & 13,pump for post-accident Containment Radiation Monitor Re 5029 Found Not Running. Caused by Component Failure Due to Pump Vane Wear.Pump Replaced & Maint Work Order Revised to Check Flaws Weekly

ML20039D304
Person / Time
Site:	Davis Besse
Issue date:	12/15/1981
From:	Eldred D TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20039D294	List: ML20039D293 ML20039D304
References
LER-81-064-03X, LER-81-64-3X, NUDOCS 8112310507
Download: ML20039D304 (3)

Text

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f lCENSEE EVENT REPORT CONTROL stocx: l l l l l l (PLEASE PRINT OR TYFE ALL REQUIRED INFORMATION) la l i l l 0 l H j D l B l S l 1 l@l 0 l 0 l - l 0 I O l 0 l 0 l 0 l - l 0 l250 l@l 26 4LICENSE l 1 l 1TYPE l 1 Jul 1 l@l l 57 CAI l@

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14 lb LICENSE NWeEH 7 8 9 LICENSEE CooE COYT l0Iil $o "E" ,ny l L l@l 0 l 5 l 0 l 0 l 0 l 3 l 416 \@l 110 l 1 12 l 811 l@l1 l 2 l 1 l s I 8 l 1 C8 69 EVENT DATE 74 75 REPORT DAT E 50 7 8 GJ 65 DOCKET NOVBER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h I l o l 2 ] l (NP-33-81-75) On 10/12/81 and 10/13/81, the pump for*RE 502L the Post-Accident con-On 10/13/81 and 11/3/81 the pump l

1 ;o;3; ltainment Radiation Monitor was found not running.

These occurrences are being reported per Technical l goj,3llfor RE 5030 was also found off.

There was no danger to the health and safety of l go,3; l Specification 3.3.3.6, Table 3.3-10.

0 s I the public or station personnel. A redundant system was always operabic. In addition {

l l o l 71 l there was no buildup of activity in containment during this time, and no release into l

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33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i o ]The cause was component failure. The flow was discovered to be at approximate 1v 3 Flow through these monitors tends to de- l 11 11 i Isefm which is the trip point for low flow.

The pump for RE 5030 was replaced and declared operable l 1 i 7 l crease due to pump vane wear.

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g lon 11/21/81. A step was added to Maintenance Work Order IC-MUO-4W2 to check and I

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.' TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION-70R LER NP-33-81-75 1l- DATE OF EVENT: October 12 and 13, and November 3, 1981.

FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Pump for Post-Accident Containment Radiation Monitor' RE 5029 was found to be off on October 12, 1981 and October 13, 1981. Pump for Post-Accident Containment Radiation Monitor RE 5030 was found off on October 13 1l and November 3, 1981.

Conditions Prior to Occurrence: The unit was in Mode 1 with Power (MWT) = 2772 and Load (Gross MWE) = 915.

Description of Occurrence: On October 12, 1981.while the operator was checking the Victorcen panel, it was discovered that the pump for RE 5029 was not running. The operator. restarted the pump. Further checking showed the computer alarm for low flow had come in at 0812 hours0.0094 days <br />0.226 hours <br />0.00134 weeks <br />3.08966e-4 months <br />, showing that the pump had tripped on. low flow.

On October 13, 1981, RE 5030 pump was found off at 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br />. The pump was restarted.

At 1830 hours0.0212 days <br />0.508 hours <br />0.00303 weeks <br />6.96315e-4 months <br /> on the same date, the RE 5029 pump was again discovered to be tripped.

The pump was restarted.

On November 3, 1981, the RE 5030 pump was found off at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br />.- The pump was re-1 started and the flow settled out at 4.5 cfm.

These occurrences are being reported under Technical Specification 3.3.3.6, Table 3.3-10 which requires that two post-accident containment radiation ~ monitors be -

operable at all-times.

Designation of Apparent Cause of Occurrence: The cause of.this occurrence was due to

,. component failure. The flow was discovered to be at approximately 3 scfm which is the trip point for low flow. Flow tends'to be reduced through a radiation monitor with time. This can be attributed to pump vane wear and vibration of the flow con-trol valves.

Analysis of Occurrence: There was no danger to the health and safety of the public or station personnel. A redundant system was always operable. There was no buildup of activity in containment during the time frame and no release into the environment.

Corrective Action: Flow was increased to 4.5 and 5 scfm. A step was added to Main-

- tenance Work. Order IC-MWO-4W2 to check and set' flows weekly until the REs are replaced with a new design. narrow and wide range containment radiation monitoring system under Facility Change Request 80-050.

LER #81-064.

____- _ yr

TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE PAGE 2 SUPPLEMENTAL INFOR'4ATION FOR LER NP-33-81-75 Under Maintenance Work Order 81-3932, the pump for RE 5030 was rebuilt and was re-turned to service on November 21, 1981.

Failure Data: Previous pump failures were reported in Licensee Event Reports 2

NP-33-81-49 (81-043) and NP-33-81-64 (81-054).

LER #81-064

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