ML20087B788
| ML20087B788 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| 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) | |
Text
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... o Carolina Power & Light Company
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Raleigh, North Carolina 27602
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',5 Y' April 13, 1971
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Division of Reactor Licensing
<e U. S. Atomic Energy Commission
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% /44 Washington, D. C.
20545 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 f
on February 3, 1971. An operational test at 2335 psig was performed satis-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
an approved procedure to ensure that no obstructions were present in the hot I
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
6-the time required to open or close met specifications. The functional; p
test of the valves verified compliance with the specifications.
o,c65 1 07 8403090366 710701
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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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Bessitc~
i Manager - Nucicar Generation I
NBB/msw cc: Mr. E. E. Utley
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