ML20148H353
| 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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Q 79, nn Docket No. 50-29 Yankee Atorr.ic Elcetric Cor pany 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 An ultraconic technique for deterajning vall thickneac concerno un.
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 cfforts to provide relicble ilta which vill oupport a conclusien that 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 POOR QUAlllY PnGES
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8011180}L(O James P. O'?cilly 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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Luz.t.i : I Tillou: pac counta ncinmuth o'ncilly j
2/7/73 i.
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