ML20107G422
| ML20107G422 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 08/08/1984 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 2NRC-4-116, NUDOCS 8411080033 | |
| Download: ML20107G422 (3) | |
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7sf 41 787 51 1 (412)923-1960 Nuclear Construction Division Telecopy (412) 787-2629 Robinson Plaza Building 2. Suite 210 Pittsburgh, PA 15205 August 8, 1984 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 ATTENTION:
Mr. Richard W. Starostecki Division of Project and Resident Programs
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 USNRC IE Inspection Report No. 50-412/83-11, Final Report Gentlemen:
This le tter provides Duquesne Light Company's (DLC) final response to the subject inspection report.
Thirty-five (35) spools received post-weld heat treatment (PWHT) under procedure N-1141-P-8.
Twenty-three (23) of these spools have been determined to be ac cept able as is.
The remaining 12 spools will receive final PWHT in the field to ensure compliance with ASME III, NB4620, Winter 1973 Addenda.
The following items describe the basis for these determinations.
1.
A BVPS-2 inspection and enforcement position relat ive to the identification of ASME code editions in the FSAR was presented to Mr. G. Walton, the NRC Senior Resident Inspector, and to NRR staf f representatives during a meeting on July 26, 1984.
This position addres ses both the concerns of Inspection Report 50-412/83-07 (Unresolved Item 83-07-02) and the concern of the subject inspection.
2.
Power Piping Company (PPCo) has revised heat treatment proce-dure N-ll41-P-8 (Revision 1 at the time of the violation) to comply with the current requirements of specification 2BVS-58.
3.
PPCo has reported that all its fabrication, examination, and testing procedures are in compliance with 2BVS-58 requirements.
4.
A furnace survey was performed in accordance with PPCo Proce-dure SFT-1, Revis ion 0.
The res ult s indicate th at a maximum variance of 75*F in the furnace working zone at the 1100*F to 8411080033 840804 PDR ADOCK 05000412 G
pon
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United Stctes Nuclect Rsgulctory Commission Mr,. Richcrd W. Staroatecki
- ;-Page 2' 1200*F_ soaking temperature range was achieved.
This degree of temperature uniformity provides sufficient assurance that the number of-recording thermocouples used was acceptable to
- control PWHT for piping spools.
- 5. ' Spools which' received acceptable.PWHT have been recertified: by PPCo.and their ANI as having received PWHT in compliance with
}i NB-4620 of ASME Section III,1971 Edition through and including Winter 1973 Addenda, and PPCo Procedure N-1141-P-8, Revision 2,
- dated November 8, 1983.
6.
Spools which received excessive heating and cooling rates during PWHT have been identified on DLC field N&D's 6841 and 7291.
7.
The actual heating and cooling rates used were determined to be technically acceptable based on an engineering calculation.
j The results showed that-the peak thermal stress was low to moderate. thus ~ supporting the acceptance of PPCo heat treatment
- practices.
However,- welds on those spools which were heat treated in ac cordance with PPCo practices and which required PWhr~in accordance with ASME III, NB4620, Winter'1973, will receive a final PWHT in the field to ensure compliance with the code.-
8.~ The base metal and -weld repairs made on Spool Nos. MSS-043-3 and -MSS-043-6 using 175'F preheat without final. PWRT are acceptab le.
The base materials have - reported carbon content less than 0.30 percent and, as such, are exempt. from PWHT
- without. preheat in accordance with ASME III,. Table NB-4623.1-2, Winter 1973.
The 2BVS-58 requirement for. a 200*F preheat for
. all P-1 material' in excess of 3/4 in. was intended to avoid potential-nonconformances due to material carbon content dif ferences and to simultaneously satisfy ANSI B31.1 and ASME III preheat rules for exempting PWHT.
9.
Document at ion for MSS-043 has been revised to reference an approved procedure qualified with the same ess'ential variables but including PWHT for shop weld "A "
'10.. PPCo Welding Procedures 10 21 and 1042 were revised to permit I'WHT temperatures _ between 1100*F 'and 1250*F which is acceptable in accordance with ASME III, Table NB-4623.1-1, Winter 1973.
l
- Requalification of these welding procedures was not required in t'
accordance with ASME ' Interpretat ion No. IX-79-13.
Spool No.
+
MSS-043-6 is-acceptable on this basis.
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Unitsd Stctes Nuclesr R gulctory Commission
' Mr. Rich:rd W. Starcatacki
...Page 3.
4
- 11. The NPP-1 forms for the acceptably heat treated spools have been : revised to include a reference to ASME III, NB-4620, Winter 1973, for PWHT.
Data for the 35 s pools covered by this report has been made available to Mr. G. Walton, the NRC Senior Resident Inspector.
DUQUESNE LIGHT COMPANY If By
'/
E. VJ. Woolever Vice President RW/wjs cc:
Ms. M. Ley, Project Manager Mr. E. A. Licitra, Project Manager Mr. G. Walton, M C Resident Inspector NRC Document Control Desk COMMONWEALTH OF PENNSYLVANIA )
)
SS:
COUNTY OF ALLEGHENY
)
On this 7 d day of M
/[9
,.before me, a
~
r Notary Public in and for said Commonwealth and County, personally appeared E. J. Woo 1 1ver,.who being duly sworn, deposed and said that (1) he is Vice President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf 'of said Company, and (3) the statements set. forth in the Submitt al are true and correct to the bes t of his knowledge.
,.,. ' g-(.
a
/ Notary Public
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'ELVA G. LESONDAK, NOTARY PUBLIC
' ' ' ' " ' ' ~
ROBINSON TOWNSHIP, ALLEGHENY COUNTY MY COMMISSION EXPIRES OCTOBER 20,198%