ML19261F360
| ML19261F360 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/29/1976 |
| From: | Creitz W METROPOLITAN EDISON CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7910250822 | |
| Download: ML19261F360 (3) | |
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PCST OFFICE BOX 510 READING, PENNSYLVANI A 19603 TELEPHCNE 215 - 929-J601 Dece=ber 29, 1976 GC.L 1777 Mr. Ja=es ?. O'Reilly, Director Office of Inspectica is Inforce=ent, Regien i U. S. :Tuclear Regulatory Oc==issic-631 Park Avenue ing of Prussia, Pennsylvania 19hC6
Dear Sir:
Three Mile Island :Iuclear Statien, 'Init 1 (CC-1)
Docket 'To. 50-289 Cperating License :To. DPR-50 II Circular 76-C6 Enclosed please find an cutline of the progra= ve vill follow at CC-1 in response to II Circular 76-06. A su==ary report of examination and evaluation of results vill follov vithin sixty days of completien of the next TMI-l refueling cutage.
Sincerely
- 4.
M.
reit:
President
'4MC:JJM:eg Inclesure: Cutline of DfI-l Progrs= in Respcase to II Circular 76-C6
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TM~ U:I~T di Sum ~n ry This report describes chemical analysis, hydrostatic testing and ultrasonic examinations which vill be performed to assure structural integrity of stain-less steel piping centaining stagnant er icv flev beric acid solution.
Secte Stainless steel piping centaining stagnant er icv flev beric acid solutien has been considered.
P Oc sm 7
Chenical Analysis A program of chemical analysis, detailed below, already exists for detec-tien of chlorides in the syste=s indicated.
The history of these analyses indicates that these systems have not centain( 1 chlorides in cencentrations above one pps.
It is vell established that stress corrosien cracking dtes not occur when chloride concentrations are belev ten pps.*
Therefore, it is inappropriate to c0nduct special tests on these s3 stems.
Monitoring fer chlorides will be continued.
In tle event that a threshold of ten ppm chloride concentration is exceeded at sc=e ti=e in the future, special testing of the piping involved vill be censidered at that ti=e.
Sa= line Cenducted for Cetection cf Chlerides Sa= le Scurce Frecuency Cecay Heat Syste:
Daily when running Scrated '4ater Storage Tanks Monthly Reactor Coolant Bleed Tanks
'deekly Core Flced Tanks Menthly Spent Fuel PEol Monthly I Latanision and Staehle " Stress Corresion of Iren-:!ickel-Chrctiu: A11cys" -
Proceedings of the COnfornance en Fundamental Aspects of Stress Corr:sien Cracking -
Septen'cer 11-15, 1967 - chio State University.
Copyrighted 1969 - ::ational Assceiation of Cerresien Engineers p
Prcgrs= 3eper; to Oetect 2
TMI Unit 1 Stress Ccrresien Cracks....
II Circular 76-C6 II.
Hydrestetic Testing In special testing conducted during April, 1976, in respense to news of stress cerrosien cracks in other F'4R plants, chloride levels in excess of ten pp= vere measured in the Reactor Building spray piping.
The levels
=easured vere similar to those cbservad at Arkansas :Tuclear Cne ( A:IO) where failures have occurred.
Conditions and naterials used at A:IO are not identical to TMI #1.
However, special testing cf the Reacter Su11 ding spray piping to detect the presence of stress corrosion cracks is appropriate in this ease.
Therefore, a hydrostatic test of the Reactor Building spray piping in accordance with ASME Section XI will be perfer=ed during the 1977 refuel-ing cutage currently scheduled for 3/19/77 thrcush h/30,'77 III. Ultrasonic Testing As a part of the special testing, an ultrasonic examination vill be perfor=ed en the Reacter Building spray piping. At least fcur selected velds vill be volu=etrically examined in accordance with ASME Section XI, Appendix I, except that the examined area vill cover a distance of approxi-
=ately six (6) ti=es the pipe thickness (but not less t".sn two (2) inches,
nor = ore than eight (8) inches). The velds to be exa= ned vill be selected en the basis of stress, prcbable exposure to chlorides and accessibility.
Examinacion vill be perfer:ed during the 1977 refueling outage currently scheduled for 3/19/77 through h/30/77
.