ML20004C484
| ML20004C484 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 05/29/1981 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8106040157 | |
| Download: ML20004C484 (3) | |
Text
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BALTIMORE GAS AND ELECTRIC CHARLES CEN TER. P.O. BOX 1475. BALTIMORE, MARYLAND 21203 ARTHUR E. LudovALL. JR.
wcc Pats 40cNT Sweety May 29, 1981 Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Rebert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing KM ts
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Docket No. 50-318 S//~ b s
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0i Inservice Inspection (ISI) Program v
Relief from ASME Code Requiitements
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%l 'A.)%,A Determined to be Impractical
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%;%s Gentlemen:
3 In accordance with 10 CFR 50.55a(g)(6)(1), we request hh 3S Commission to grant exemption from an ASME Code requireiiten N b that has been determined to be impractical.
In accordance with NRC Staff Guidance letter dated November 24, 1976, the information concerning.the exemption request is presented herein.
During installation of a new motor operated valve in a two (2) inch, Class 2 pipe, an are strike was made on the pipe adjacent to the socket weld being performed.
The following steps were performed to repair the are strike:
1)
The are strike was removed by grinding, 2)
A liquid penetrant test was performed on the affected area after grinding, 3)
A weld repair was made, 4)
The weld build-up was then made smooth with the pipe surface by grinding, (A
<p 81 e6 04 o I 57 sAf A
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Robert.A./ Clark May 29,.1981 5)
A liquid penetrant: test was performed on the weld repair.after grinding, and-6)
A hydrostatic pressure test was performed at 1.25 times the design pressure after the weld repair was completed.
In addition to the above requirements, the Code also requires that a radiograph be performed after the repe.ir.
An acceptable' radiograph examination of the repaired area would be impractical, if not impossible to perform due to the geometry of the repair with respect to the socket weld and the angle of the. radiograph beam required to clear interferences around the pipe.
The Commission is requested to exempt the requirements for performing a radiograph examination in this particular case.
A tabulation of the information required for this request is presented below.
I..
Component for Which Relief is Requested:
A.
Name and Number Piping line number 2"-GC-5-2008 is the cross connect-from the shutdown cooling line to the low pressure safety injection line.
This line is shown as 2"-GC-5-1008 in Figure 6-1 (F-4) of the FSAR.
B.
Function The' primary function of this line is to provide a means of flushing the reactor core in a reverse flow.
direction should a large. break LOCA occur.
The are strike occurred when installing a motor operated valve in this line.
This modification will allow the operators to align the system for core flushing from the control room and is considered a NUREG-0578 Section 2.1.6.b requirement.
C.
Code Class Regulatory Guide 1.26:
Class 2 Original Design:
B31.7 Class 2 II.. Code Requirement from Which Relief is Requested:
The arc strike was. repaired in accordance with ASME Code Section XI 1974 Edition with Addenda through Summer 1975.
Since this particular repair is not specified in this Code the repair was performed in accordance with the Code applicable to.the construction of the component as required d'
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..y
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Robert.A. Clark
- May 29, 1981' by IWA-4100(c).
USAS B31.7-1969 with'1970 Addenda para-graphs 20724.6.and 7 were followed to perform the repair with the exception of a radiograph examination as required by 2-724. 7(e).
It is the requirement of performing a radiograph examination from which relief is requested for.
this particular repair.
III.
' Supporting Information An acceptable radiograph examination of the repaired-area would be impractical due to the geometry of the repair with respect to a socket weld and the angle of the radiograph beam required to clear interferences such as other pipes and supports around the pipe.
We have discussed this exemption request with Mr. R. E. Architzel, our Resident NRC Inspector.
We have determined that this request constitutes a Class III Amendment pursuant to 10 CFR 170.22, and accordingly a BG&E check in the amount of $4,000.00 is submitted herewith.
Should you have further questions regarding this subject, please do not hesitate to contact us.
Very truly y 'fs, wc-7
' T l
Vice President-Supply AEL/BCR/gla cc:
J. A. Biddison, Esquire G. F. Trowbridge,' Esquire E. L. Conner, Jr. (NRC)
E. Jernigan, (NRC-Region I)
R. E. Architzel, (NRC)
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