ML20087B788

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Submits Response Re Tests Performed on Safety Injection Sys Mod to Ensure Integrity of Sys.Mods Were Required Because as-built Sys Did Not Fulfill All Design Performance Objectives
ML20087B788
Person / Time
Site: Robinson Duke Energy icon.png
Issue date: 04/13/1971
From: Bessac N
CAROLINA POWER & LIGHT CO.
To: Morris P
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20087B779 List:
References
NUDOCS 8403090366
Download: ML20087B788 (2)


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. O O' Carolina Power & Light Company

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Raleigh, North Carolina 27602 g i, g'e

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April 13, 1971  %

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}p, fpg 'W Dr. Peter A. Morris Division of Reactor Licensing ro x

_ Yjy U. S. Atomic Energy Commission <e 7 Washington, D. C. 20545  % /44 \8 Re: Facility License No. DPR-23 Docket No. 50-261

Dear Dr. Morris:

In response to a request from your Staff, concerning the tests performed on the safety injection system modification to ensure integrity of the system, we submit the following information:

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%c Company has completed the modifications to the H. B. Robinson Unit No. 2 safety injection system discussed with your Staf f on January 22, 1971, and documented in our letter to you of January 25, 1971. The system modifications were required because the as-built system did not fulfill all .

design performance objectives for accident conditions.

Ec modifications to the system included:

1. Two additional 3-inch valves, SI-870A and 870B, arranged in paralici, installed in the cold icg SI line downstream on the Boron Injection Tank.
2. A 2-inch cross-connection installed between the two hot leg injection lines just downstream of valves SI-866A and 866B.

A hydrostatic test at 2250 psig was performed satisfactorily on '

valves SI-870A and 870B and adjacent piping affected by the cold icg modific M on February 3, 1971. An operational test at 2335 psig was performed satis-f factorily on the cross-connection piping in the hot leg downstream of valves SI-866A and 866B on February 4, 1971, l

1 A flow test was conducted on February 5, 1971, in accordance with l

I an approved procedure to ensure that no obstructions were present in the hot l

and cold leg injection flow paths. This test verified flow through both l

S 70A and 870B and also through the hot leg cross-connection line, Valves SI-870A and 870B were functionally tested to ensure that p p 6- the time required to open or close met specifications. The functional; test of the valves verified compliance with the specifications.

8403090366 710701 o ,c65 1 07

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PDR ADOCK 05000261 P PDR 00P1 SENT. REGION

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j.Q ?. v Dr. Peter . Morris April 13, 1971 4 4 All socket veld joints were liquid penctrant tested and all butt 1

weld joints were radiographed. All welds were verified to be satisfactory.

i We hope that this information concerning the testing conducted on the safety injection system will assist the Staff in assessing the ade-quacy of this modification.

Yours very truly, i

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}N.'/ . Bessitc~

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Manager - Nucicar Generation I -

NBB/msw cc: Mr. E. E. Utley

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