ML19242B436

Responds to IE Bulletin 79-04 & 790330 Ltr.Will Use 3-inch Valves in Primary Component Cooling Sys & 6-inch Valves in Thermal Regenerating Sys B.No Corrective Actions Necessary on Velan Swing Check Valves

ML19242B436
Person / Time
Site:	Seabrook
Issue date:	05/25/1979
From:	Alice Shepard PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 7908080516
Download: ML19242B436 (2)

Text

7A 1] PU LIC SERVICE Company of New Hampshir e May 25, 1979 SB-7810 T.F. B 4.2.5 U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention: Office of Inspection and Enforcement

Reference:

1. Docket No. 50-443 and 50-444

2. NRC letter dated March 30, 1979

3. IE Bulletin No. 79-04

Dear Sir:

We have reviewed the referenced IE Bulletin and have the following responses:

1) Seismic Category I piping systems in which 3, 4, or 6 inch Velan swing check valves are to be installed are as follows:

a) Primary Component Coolant System - 3 inch valves b) Boron Thermal Regenerating System - 6 inch valves

2) In the analysis performed on the Primary Component Coolant System line, a unit valve weight of 200 lbs was used. We were advised by Velan that the valve weight was 108 lbs rather than the 200 lbs on the drawing. Upon receipt of the new valve weight of 108 lbs, the analysis of the one line containing the sving check valve was reviewed for impact; the results were acceptable. Three remaining lines in the Primarf Component Cooling System containing similar valves are in process. Since the piping configurations of these lines are similar, tne results should be similar and therefore acceptable.

3) On the Baron Thermal Regenerating System, Westinghouce and 790808056- ,-

509 13/

1000 Elm St.. P O. Box 330 MenChester*, NH 031CS Tecohone Go3/SENOOO

U.S. Nuclear Regulatory Commission Page 2 SB-7810 Velan Engineering Companies have verified that the weights of the Velan swing check valves provided on the drawings were accurate by comparing the weights identified en the drawings to the actual manufactured weights. If the as-manufactured weight did not exceed the drawing weight by 15 percent the drawing weight was considered accurate.

4) Based on the above, no corrective actions are deemed necessary on Velan swing check valves.

5) No modifications are required to the piping systems or supports because of changes in the valve weights.

Very truly yours, Arthur M. Shepard Manager of Projects AMS:tla cc: B.B. Beckley J.H. Herrin 509 138