ML19095A510
| ML19095A510 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 04/04/1978 |
| From: | Stallings C Virginia Electric & Power Co (VEPCO) |
| To: | O'Reilly J NRC/RGN-II |
| References | |
| Serial No. 175 LER 1978-004-03L-0 | |
| Download: ML19095A510 (4) | |
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Mr. James. p j. O'lteilly;* Director:* Off ice o:!: Inspection and. Enfoz:cement.
- U. S *. Nuclear *,Re'gulatory Commission.
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*.Pursu4nt. 'to .. Surcy,.Power St~tion* ~ech1iicel Sp~cification*6~6~2.b(2), :the.
Virg:!.nia 'El.ectric -a.r.d. J?ower Ccimp.a.ny *:h~r.eby submits . tl~c :following Licensee Event .Repor:t .:for Surrf Unit: No, f. - -
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~ I During normal full power operat't"on, it was observed that there was no ser 1
~ vice water flow through Charging Pump Intermediate Seal Cooler 2-SW-E-lB.
1 [QJ}J Cooler 2-SW-E-lA was verified in service and the "B" cooler was. isolated ! [[TI] for investigation. This event is contrary to T.s.* 3.3.A.8.c *and* is report 1
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~ I Loss of flow to the Charging Pump Intermediate Seal. Cooler was due to the, failure of the cooler's discharge gate valve. Corrosion of the gate valvejs .* .ITITI stem caused its disc to drop free and obstruct service water flow. The CIIIJ I disc was removed from the valve and the cooler returned to service. Sub-lIIi] I sequently, a new stem was fabricated and the disc and new stem inst~lled.
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Virginia Electric and Power Company Surry Power Station, Unit 2 Docket No. 050-0281 LER-78-0ll/03L-0 Event Date 3-5-78 Loss of Service Water Flow Through the Charging Pump Intermediate Seal Cooler
- 1. Descr{ption of Event On 3-5-78, at about 1300, with the unit at full rated power, it was observed that there was no service water flow through Charging Pump Inter-mediate Seal Cooler 2-SW-E-lB. This event is contrary to Technical Speci-fication 3.3.A.8.c. and is reportable in accordance with Technical Speci~
fication 6.6.2.b(2).
- 2. Probable Consequence of Event The loss of the Charging Pump Intermediate Seal Cooler 2-SW-E-lB had no effect upon the health or safety of the general public because adequate cool-ing of the Charging Pump Component Cooling System was available via the "A" Charging Pump Intermediate Seal Cooler, which is a full size cooler.
- 3. Cause of Event The loss of flow to the "B" Intermediate Seal Cooler was due to the fail-ure of the cooler's ~ischarge gate valve. Corrosion of the stem permitted the disc to drop free and opstruct the service water flow path.
- 4. Intermediate Corrective Action The inunediate action was to verify flow to Seal Cooler 2-SW-E-lA. Cooler "B" was then .isolated, the suspected valve was opened and the disc removed. A new stem was fabricated from stainless steel. The new stem and old disc were re-installed and the valve returned to service.
Following repair of the "B" cooler discharge valve, the "B" cooler was placed in service. The "A" cooler was isolated to examine its discharge valve. A similar condition of stem corrosion was found but had not advanced to the point of dropping the disc. A new stem was fabricated and installed in this valve.
- 5. Scheduled Corrective Action All 1 1/2 and 2 inch valves in the Charging Pump Service Water System will be inspected during the current Steam Generator evaluation outage.
- 6. Action Taken to Prevent Recurrence An engineering study was instituted to identify possible long term correc-tive action. From observation of the failed components, it was decided that the mode of corrosion was predominantly galvanic, due to the brass stem in contact with bronze disc. The brass, being the anode of this galvanic couple, would be
Virginia Electric and Power Company Surry Power Station, Unit 2 Docket No. 050-0281 LER-78-011/0JL-0 Event Date 3-5-78 Loss of Service Water Flow Through the Charging Pump Intermediate Seal Cooler wasted, as was observed. Present intentions are to replace the existing valves with a valve design that embodies less dissimilarity of materials and possesses
. a "fail-as-is" design.
- 7. Generic Implications The event possesses generic implications in that the corrosion observed in the cooler outlet valves may also exist in other gate valves of the Charg-ing Pump Service Water System. The extent of the problem will be known follow-ing the inspection identified in Item 5 above.}}