ML19270H103

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Responds to IE Bulletin 79-04 Re Incorrect Weights for Velan Swing Check Valves.Incorrect Valve Weights Not Used.No Mod Required
ML19270H103
Person / Time
Site: 05000484
Issue date: 05/22/1979
From: Dienhart A
NORTHERN STATES POWER CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NLR3-09, NLR3-9, NUDOCS 7906230020
Download: ML19270H103 (2)


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May 22, 1979 Mr J G Keppler, Director NLR3-09 Office of Inspection and Enforcement U S t;uclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 TYRONE ENERGY PARK E-7470 Docket No. STN 50-484 Dear Mr Keppler Your letter dated March 30, 1979 forwarded IE Bulletin No. 79-04. The Bulletin concerned incorrect weights for swing check valves manufactured by the Velan Engineering Corporation and requested certain actions by licensees and permit holders. The following information is provided in response to your letter. The items below are numbered to match the Bulletin action items.

1. The following seismic Category I piping systems will utilize 3, 4, or 6 inch Velan swing check valves:
a. Component Cooling Water System
b. Essential Service Water System
c. Reactor Coolant System -
d. Auxiliary Feedwater System
e. Feedwater System IO79
f. Compressed Air System
g. Auxiliary Turbines System
2. The correct valve weights were used in piping analysis. On April 20, 1979, the Velan Engineering Corporation informed the SNUPPS architect /

engineer, Bechtel, that the weight of all swing check valves as shown on project engineering drawings were acceptable. Bechtel reviewed relevant piping stress analyses to verify that weights used were equal to or greater than those shown on the Velan drawings. This review was completed by May 2, 1979.

2247 093 700623 0D#D

NORTHERN STATES POWER COMPANY Page 2 May 22, 1979 Mr J G Keppler

3. Incorrect valve weights were not used.
4. No modifications are required because the correct valve weights were used.
5. This item is not applicable because modifications and/or stress reanalysis were not required.
6. This item is applicable to holders of operating licenses only.
7. No outstanding matters in items 1 through 5 above have been identified. Documentation of our actions in regard to this IE Bulletin are available for NRC inspection.

Yours very truly I

(

e AVD/K cc U S Nuclear Regulatory Cormiission Mr John Davis, Acting Director Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D C 20555 2247 094

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