ML20148H353

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Ack Receipt of Discussing Results of Valve Wall Thickness Verification Program.Disagrees W/Conclusion That Five Stainless Steel Reactor Coolant Loop Isolation Valves Do Not Need to Be Verified
ML20148H353
Person / Time
Site: Yankee Rowe
Issue date: 02/07/1973
From: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To: Vandenburgh D
YANKEE ATOMIC ELECTRIC CO.
Shared Package
ML20148H357 List:
References
NUDOCS 8011180240
Download: ML20148H353 (1)


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79, nn Yankee Atorr.ic Elcetric Cor pany Docket No. 50-29 Attention: Mr. D. E. Vandenburgh, Vice President ,

20 Turnpike Pond Westboro, Hassachusetts 01581 Gentlenen:

Thank you for your letter of January 15, 1973 discussing the results-of the valve ball thickness verifiestfon program at Yankee-Fowe (bpR-3) as requested in our letter of June 22, 1972.

We t.re not in agreenent with your conclusion that five of the stain-less accel reactor coolant loop isolation valves do not necd to be verified since the other three tr.cet N.SI P.16.5, and the plant history records no failures. The fact that ultrasonic s.casurcrents were

- successful on three valves but unsuccessf ul on the rer.nining five concerno un. An ultraconic technique for deterajning vall thickneac in which only three of cipht valves were measurabic due to the vnria-tien in grain otructure. does not appear to hr.vc produced the r'ecuired results. It rny be necessary to develop an altercate ecched which will produce the dirensional data necessary to confira the wall thickness of these five valves.

We will be picano.d to diccuss this matter further at a rutually cen-venient tire , however , our requircrenta concerning verification of valve ,

vall thickncas remain firn, and we c:pect that you will centinue your l cfforts to provide relicble ilta which vill oupport a conclusien that l all of your reactor coolant icolation valves teet the applicable codes for cast stainicas cteel co: ponents. Picane advise us within 30 days of your proposed pro,7.ra:: to acet=ulate this inf erration.

Your cooperatibn with us is appreciated. .

sincerely, THIS DOCUMENT CONTA!Ns l POOR QUAlllY PnGES

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8011180}L(O James P. O'?cilly l

R0 Chief, Reactor T & Ops. Br.

bec: no Chief, Reactor Construction Branch, EQ ER Central Filec RO:0Q (4) png Directorate of Licensing, HQ (4) Local PDR

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Tillou: pac counta ncinmuth o'ncilly j >

2/7/73 .

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