ML20066F710
| ML20066F710 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 11/15/1982 |
| From: | Morisi A BOSTON EDISON CO. |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| References | |
| 82-296, NUDOCS 8211190138 | |
| Download: ML20066F710 (8) | |
Text
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BOSTON EOisON COMPANY GENERAL OFrscES 300 EDYLSTON STREET EDSTON MASSAcNUSETTS O2199 A. V. M O RISI MANAGER NUCLEAR OPERATIONE SUPPOfiT DEPARTMENT November 15, 1982 BECo. Ltr. #82-296 Mr. Domenic B. Vassallo, Chief Operating Reactors Branch #2 Division of Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D. C.
20555 License No. DPR-35 Docket No. 50-293 ISI Relief Requests Ref.(a): Telephone Conference, dated 10/20/82, with BECo and NRC to Discuss ISI
Dear Sir:
Boston Edison's answers to your request for further information regarding Code Relief Request #7 and #10 are presented below. These answers were verbally trans-mitted to the members of your staff involved in the review of this subject via the Reference (a) telephone conference.
Question 1 In regards to visual examination of internal pressure boundary surfaces of valves (Relief Request #7) provide a list of the valve categories for which at least one valve has had this examination during maintenance.
What un-satisfactory results, if any, were observed? Provide any other information
(
that shows whether the examined valves are a reasonable sample of primary system valves. Provide a specific relief request for each valve category for which such an examination has not been made. List and discuss extenu-ating circumstances such as high radiation level, necessity to drain reactor vessel, etc., in each instance.
Response
Boston Edison has identified 56 valves which are divided into twenty specific categories (seeattachment). Maintenance requests dating back to 1971 were
!90[
reviewed to develop a case history for each valve. The results of this review are as follows:
1.) Valves in six categories (3, 7, 9,13,19, 20) have been dis-assembled for maintenance and the internal surfaces have been visually examined.
8211190138 021115 PDR ADOCX 05000293 G
COSTON EolZON COMPANY Mr. Domenic B. Vassallo, Chief November 15,1982 Page 2 2.) Valves in n'ine categ r ?es (1, 4, 5, 8, 10, 12, 14, 16, 18) are included in the Loca
'ak Rate Test (LLRT) Program.
If'a valve in any of these ca+-
ries failed the LLRT and required disassembly, the internal sur k es of these valves would be visually examined.
3.) Disassembly of valves in Category 2 (suction and discharge valves) requires that the core be unloaded and that the water level be lowered below the core support structure.
4.) Disassembly of valves in Categories 6 and 17 would involve high radiation exposure ( > 1.5 Rem) to personnel and are located in a limited access area-The valves in question are:
a.) RWCU - 1201-81 (Category 6) b.) RHR testable check valves - 1001-68A, 68B (Category 17) 5.) The remaining two valve categories (11,15), which are ccmprised of three check valves, will have one valve from each group dis-assembled for visual examination, once each inspection interval.
The valves in question are:
a.) RHR 1001-64 (head spray valve) Category 11 b.) RCIC 1301-50 (pump discharge valve) Category 15 c.) HPCI 2301-7 (pump discharge valve) Category 15 Question 2 In regards to pump casing welds (licensee's Relief Request #10) has consideration been given to the MINAC technique developed by EPRI? Is it practical for this application? Would it require disassembly of the pump?
If so, could the inspec-tion of the internal pressure boundary surface (Relief Request #8) be done at the same time?
Response
Boston Edison is withdrawing its request for code relief regarding the visual inspection of (pressure retaining) welds in pump casings. The basis for this withdrawal request is the result of a reevaluation of the reference weld and the subsequent detemination that this weld can be classified as a non pressure re-taining weld, We feel this information adequately answers your questions. Should you require any additional infomation, please contact us.
Very truly yours, ldlM-
/llU$54' Attachment
ATTACHMENT 1 ASME SECTION XI VALVE CAT. B-M2 (1974 EDITION)
CROUP.
" MANUFACTURER TYPE
. SIZE
'* SYSTEM DESICNATION 1.
VELAN, (N14 &:N14M4)
- QATE,
. 4"-
J RHR (HEAD SPRAY) 1001-60
~
~10",
HPCI 2301-4 2301-5
~
.c
~'
.y 2
DARLING (21 Al'342)
.CATE; 22" RECIRCULATION 202-6A 202-6B
.e4 28" RECIRCULATION 202-4h 202-4B 202-5A
, i.,.
s 202-5B.
i 3
ATWOOD & H0RRILL (M-1) '.
CLOBE 20" MAIN STEAM 203-1A
,a 203-2A 203-1B 203-2B
PAGE 2 ASME SECTION XI VALVE CAT. B-M2 (1974 EDITION)
CROUP
, HANUFACTURER TYPE SIZE SYSTEM DESICNATION 3
ATWOOD & HDRRILL (M 1).
CLOBE 20" MAIN STEAM 203-1C (continued) 203-2C l
203'-ID 203-2D 4
WALWORTH (N10H4)
CATE 6"
RWCU (in) 1201-82 18" FEEDWATER 57-A' 57-B 5
WALWORTH (N14H4)
CATE 20" RHR 1001-47 6.
WALWORTH (N216H4)
CHECK 6"
RWCU (in) 1201-81
~7 WALWORTH (N14H3)
CATE 4"
' RHR' (HEAD SPRAY) 1001-63 1201-5 6"'
'RWCU (out) 1201-83 1201-2
a ASME SECT 10il XI VALVE CAT. B-M2 (1974 EDITION)
CROUP
- MANUPACTURER TYPE SIZE SYSTEM DESICNATION 7
WAIRORTH (N14M3)
CATE 10" CORE SPRAT 1400-25A (continued) 1400-25B
'8 WAIRORTH (N14M3)
CATE 10"'
, CORE SPRAY iann_si 1400-6B 1001-33A 9
WAIRORTH (N14M3)
CATE 18" RHR 1001-29A 1001-338 1001-295 s
20" RHR 1001-50 1
10 WAIRORTH (N14M3)
CATE 20" RHR 1001-51 11 WAIRORTH (N219M3)
GECK 4"'
- RHR 1001-64 12 WAIRORTH (N116M3)
'CLOBE 4" '
'RWCU 1201-80 13 ANGOR (N214M4)
'OlECK 18"
-FEEDWATER 58-A 4
i t
58-B 62-A 3
NO ITANC I
SED A
3 4
4 4
3 3
E 0
0 G
2 2
A P
M ETSY M
S AET S
N IA M
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B TAC
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s N
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V I
I L
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6 A
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4 7
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T T E M
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F L A
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R ERUTCAFU NAM Y
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- 1 1
1
PAGE 5 I
ASME SECTION XI VALVE CAT. B-M2 (1974 EDITION) 1 CROUP MANUFACTURER TYPE SIZE SYSTEM DESICNATION l
13 (continued > ANG0R (N214M4)
GEM 18" FEEDWATER 62-B l
14 ANGOR (N10)
CATE 14" HPCI' 2301-8 15 ROGWELL (N277M4)
GECK 4"
2301-7 16 ROGWELL (N277SP)
TESTABLE 10" CORE SPRAY 1400-9A GECK 1400-95
/
i.
j 17 ROGWELL (N277SPM3)
TESTABLE 18" RHR 1001-68A GEM j
1001-685 18 POWELL (N10)
CATE 4"
RCIC (in) 1301-49 19 TARCET Ro m RELIEF 6"
MAIN STEAM 203-3A VALVES i
203-38 i
e i.
203-3C l
i 1
203-3D
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5 E
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LAJ O
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W Y
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