ML20084L075
| ML20084L075 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 05/24/1974 |
| From: | Kalivianakis N COMMONWEALTH EDISON CO. |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084L072 | List: |
| References | |
| NJK-74-89, NUDOCS 8305200212 | |
| Download: ML20084L075 (2) | |
Text
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T r'ost Othee Box 216 Cordova,!!Iinois 61242 Telephone 309/654-2241 NJK-74-89
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.._i May 24, 1974
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'd S Mr. John F. O' Leary, Director
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o N' Directorate of Licensing 3'. '
Regulation U.S. Atomic Energy Cornission Washington, D.C.
20545
Reference:
Quad-Cities Nuclear Power Station, Unit 2, Docket No. 50-265, DPR-30, Appendix A, Sections 1.0.A.4 and 6.6.B. I.a
Dear Mr. O ' Leary:
The purpose of this letter is to inform you of the details of an abnormal occurrence which was discovered on May 16, 1974. With Unit 2 operating at 755 MWe, the "B" looo of the RHR system service water pining was inspected for leaks using a closed circuit TV camera. During the insnection, a lump was discovered in the interior of the pipe. The occurrence was reported to the Region lli Directorate of Regulatory Operations by telephone and to you and _the Region t il Directorate of Licensina by telegram on Mcy 18, 1974.
PROBLEM AND INVESTIGATION As a result of the findings of the investigation of the leakage from the "A",
or lower, RHR service water line on Unit I as reported in my letter of April 15, 1974, and followed by Quad-Cities Snecial Renort Number 13, it was agreed that the lower RHR service water line on Unit 2 be inspected. The line was removed
.f rom service at 2220 on May 14. The inspectlon, conducted on May 16 revealed a lump in the lower section of line 2-1005B-16"-D located 40' 9" west of the in-side wall of #2 HPCI room. There were no leaks or cracks found. The nortions of the pipe which had been removed to insert the TV ccmera were welded back in place on May 17. The various welds necessary to perform the inspection were magnetic-particle checked following weld comoletion. An operating hydrostatic test was conducted on the 2B RHR service water loop. The hydro verified the i
integrity of the 2B service water piping and it was placed back in service at 2000 on May 17.
SAFETY IMPLICATIONS Both loops of the low pressuee coolant injection node of the RHR system were operable at all times. One loop of containment cooling was ooerable as were Unit 2 and emergency diesels as required by Technical Specifications. The errount of time the 2B RHR service water system was out of service was minimized.
The successful hydrostatic test adds assurance that the line is still intact and safe for use. Therefore, the safety margin provided by the conteinrrent cooling mode of the RHR system is not affected.
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