ML19256E863
| ML19256E863 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna  |
| Issue date: | 10/29/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 7911150445 | |
| Download: ML19256E863 (2) | |
Text
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UNITED STATES d 'c9fO NUCLEAR REGULATORY COMMISSION n
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101 MARIETTA ST., N.W., SUlTE 3100 g*
ATLANTA, GEORGIA 30303 OCT 2 91979 In Raply Refer To:
RII:JPO 50-338 50-280 50-281 Virginia Electric and Power Company Attn:
W. L. Proffitt Senior Vice President, Power P. O. Box 26666 Richmond, Virginia 23261 Gentlemen:
The enclosed Bulletin No. 79-17, Revision 1 is. cwarded to you for action. A written response is required.
If you desite additional information regarding this matter, please contact this office.
Sincerely, O'.---- -
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James P. O'Reilly Director
Enclosure:
IE Bulletin No. 79-17, Revision 1 w/encls.
1337 307 7 911150 +9-5
OCT 2 91979 Virginia Electric and Power Company cc w/ enc 1:
W. R. Cartwright, Station Manager Post Office Box 402 Mineral, Virginia 23117 P. G. Perry Senior Resident Engineer Post Office Box 38 Mineral, Virginia 23117 W. L. Stewart, Manager Post Office Box 315 Surry, Virginia 23883 O
133J7 30B
UNITED STATES SSINS No.:
6820 NUCIIAR REGULATORY COMMISSION Accession No.:
OFFICE OF INSPECTION AND ENFORCEMENT 79082201$7 WASHINGTON, D.C.
20555 3
October 29, 1979 IE Bulletin No. 79-17 Revision 1 PIPE CRACKS IN STAGNANT BORATED WATER SYSTEMS AT PWR PLANTS Description of Circumstances:
IE Bulletin No. 79-17, issued July 26, 1979, provided information on the cracking R1 experienced to date in safety-related stainless steel piping systems at PWR R1 plants.
Certain actions were required of all PWR facilities with an operating R1 license within a specified 90-day time frame.
R1 After several discussions with licensee owner group representatives and inspection R1 agencies, it has been determined that the requirements of Item 2, particularly R1 the ultrasonic examination, may be impractical because of unavailability of R1 qualified personnel in certain cases to complete the inspections within the time R1 specified by the Bulletin. To alleviate this situation and allow licensees the R1 resources of improved ultrasonic inspection capabilities, a time extension and R1 clarifications to the bulletin have been made. These are referanced to the R1 affected iteas of the original bulletin.
R1 During the period of November 1974 to February 1977 a number of cracNing incidents have been experienced in safety-related stainless steel piping systems and rar-tions of systemc which contain oxygenated, stagnant or essentially stagr.snt bor-ated water. Metallurgical investigations revealed tho e cracks occurred in the weld heat affected zone of 8-inch to 10-inch type 30-> material (schedule 10 and 40), initiating on the piping I.D. surface and prop'. gating in either an inter-granular or transgranular mode typical of Stres= Con tsion Cracking. Analysis indicated the probable corrodents to be chloride and oxygen contamination in the affecwd systems. Plants affected up to this time were Arkansas Nuclear Unit 1, R. E. Ginna, H. B. Robinson Unit 2, Crystal River E.it 3, San onofre Unit 1, and Surry Units 1 and 2.
The NRC issued Circular No. 76-06 (copy enclosed) in view of the apparent generic nature of the problem.
During the refueling outage of Three Mile Island Unit I which began in February of this year, visual inspections disclosed five (5) through-wall cracks at welds in the spent fuel cooling system piping and one (1) at a weld in the decay heat removal system. These cracks were found as a result of local boric acid buildup and later confirmed by liquid penetrant tests. This initial identification of cracking was reported to the NRC in a Licensee Event Report (LER) dated May 16, 1979. A preliminary metallurgical anal--#-
section of cracked and leaking weld jo' DUPLICATE DOCUMENT R1 - Identifies those additions or rev Entire document previously entered into system under:
1337 309 79dM'JM5/37 ANO g a r No. of pa es: