PM-79-116, Updates Re 790124 Scram.Informs of Satisfactory Leak Rate Test of Valve E11-F015A & Insp Results of Torus Spray Header,Piping & Hangers.No Significant Damage Found
| ML19270F510 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 01/31/1979 |
| From: | Manry M GEORGIA POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| PM-79-116, NUDOCS 7902150310 | |
| Download: ML19270F510 (2) | |
Text
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f'im Georgia Power Edwin 1. Hatch flu:' ear Plant
(*;y ;OU!! t'ff! C't-C!s t Sy 3,*Ptn January 31, 1979 PM 116 PLANT E. I. HATCH Update of Letter of 1/30/79 Concerning Unit 1 Scram of 1/24/79 Mr. James P. O'Reilly United States Nuclear Regelatory Commission Region II Suite 3100 101 Marietta Street Atlanta, Georgia 30303
Dear Sir:
3 On January 30, 1979, a letter was sent to you depicting the events leading to the scram of Hatch Unit I on 1/24/79.
Also included was the information con-cerning the cause, the repairing of Ell-F015A, and our plans to leak rate test the Ell-F01'5A valve.
Additionally, we mentioned our plans to inspect the torus spray header, the spray header piping and hangers for any possible damage before making a determination on proceeding with plant start-up.
The leak rate test of valve Ell-F015A was satisfactcrily completed on the evening of 1/3C/79.
The following areas of the torus were inspected on 1/30/79 with the indicated results:
a.
RHR, Torus Spray Header Loop "A" piping welds:
Welds were visually in-s,pe'cted and there were no indications of cracked of defective welds.
b.
Loop "B" piping welds:
Welds were visually inspected and there were no indications of cracked or defective welds.
c.
Loop "A" hangers and restraints:
Hangers en the piping from the Ell-F027A
- valve to the X-211A torus penetration were visually inspected and no abnormalities were found.
d.
Loop "B" hangers and restraints:
Hangers on the piping from the Ell-F027B valve to the X-211B torus penetration were visually inspected and no abnormalities were found.
e.
Torus Spray Header Surface Paint:
Paint appears to be worn on pipe in area of the spray nozzle clusters, due possibly to high pressure steam or water impinging against pipe.
In regards to blistering or scalding of paint on O
piping there is no physical evidence of any occurrence.
On remaining torus spray header piping, there was not any evidence of blistered or scalded paint.
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[%o 790215 03W J
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e Page 2 Janua ry 31, 1979 PM-79-116 f.
Surface Painting of Torus Shell:
Interior surface paint inspection of the torus shell did not reveal any abnormal conditions other than the shell appears dirty due possibly to water turbulence of the pool.
g.
Torus Header and Associated Supports: A couple of hangers did appear to be slightly bent; however, structural integrity of the hangers was not violated.
Repair of the hangers is not considered necessary due to minor displacement of the hangers.
The deviations do not appear to be caused by possible pipe movement with the exception of one hanger.
l This hanger does not. affect the integrity of piping and cannot be determined when it occurred.
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