ML19206B242
| ML19206B242 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 10/20/1970 |
| From: | James O'Reilly US ATOMIC ENERGY COMMISSION (AEC) |
| To: | John Miller METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7905080156 | |
| Download: ML19206B242 (2) | |
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,' h ATOMIC ENERGY COMMISSION e
OlVir. ION OF COMPLI ANec 201 c4L 3952
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Dr.T 2 0 1971 Metropolitan Edis;n Co=pany Attention:
Mr. J. C. Miller, Vice President P. O. Ecx 542 Reading, pennsylvania 19603 Docket No. 50-320 Centlenen:
This letter r. elates to the discussion Mr. R. E. Oller of the Division of Co pliance, Region III, held with Mr. J. A. Van Meter and me=bers of his staf f of the Babcock and Wilcox Cc=pany at the conclusion of the reactor pressure vessel inspection conducted on August 24 and 25, 1971, regarding the construction activitics authorized by AEC Construction Permit No.
CPFR-66 for the Three Mile Island No. 2 Facility.
As noted during the discussion, an apparent deficie:ncy was identified in-volving an item not in conformance with a statement in the preliminary safety analysis report. The item is as follows:
The preliminary safety analysis report, Volume 2, Section 4, paragraph 4.5.2, titled " Reactor Vessel" s tates :
"The reactor vessel will be designed, manufactured, and tested in accordance with Section III of the ASME codes..."
Paragraph N-528.2 of Section III, last sentence, states :
"The post-weld heat treating rules in N-532 shall apply to all weld repairs." Paragraph N-532 requires all welded pressure vessels or pressure vessel parts shall be given a post-weld heat treatment at a te=perature and for a holding time period not icss than that specified in Table N-532.
Table N-532 requires a minimum holding time of one hour per inch of weld thickness at a minimum temperature of 1100 F for material subgroup 1, P-12b (ASTM A-508 Class II material;)
Contrary to this requirement, a stress relief holding time for a 7.5 inch deep weld repair in a 12 inch thick weld (previously stress relieved) joining the Mk 18-2 recirculation inlet nozzle to the shell of the reactor pressure vessel was limited to 7.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> versus apparent code require =ents of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
Picase provide us, within 30 days, with your ce=nents concerning these itecs and any steps which have been or will be taken to cor. rect 9m q
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a in Your reply should emphasize, them, and to minittize recurrences.
particular, any changes that have been or will be made to your quality es si.irence program.
Should you have any nuestions concerning the catters discussed in this office.
1ctter, you may co=unicate directly with this Very truly yours, James P. O'Reilly Director CO:I:E}DI bec:
A. Gia=busso, C0 R. H. Engelken, CO L. Kornblith, CO CO (5)
J. B. Henderson, V DR Central Files t
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