ML20005B690
| ML20005B690 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 08/11/1981 |
| From: | Morisi A BOSTON EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 81-196, IEB-81-01, IEB-81-1, NUDOCS 8109010228 | |
| Download: ML20005B690 (4) | |
Text
e B O STO N EDISON COMPANY GENERAL OFFICES B00 BOYLETON STREET 90STON. MAS EACH US ETTE D 219 9 A. V. M O RiS t MANAGER NUCLEAR OPERATIONS SUPPcRT DEPANTMEP.T August 11, 1981 BECo.
--*M1-196 Ot l y
Mr. Boyce H. Grier g
Office of Inspectfan and Enforcement
\\bgN/ h Region I 2
U.S Nuclear Regulatory Commission 9-V., Q.
A 9,3#g 631 Park Avenue
/
King of Prussia, PA 19406 gs cke id Response II to IE Bulletin No. 81-01
Dear Sir:
This letter provides Boston Edison Company's response to Item #3 of the subject bulletin, which reqeusted examination of mechanical snubbers to determine current condition.
Item 3.
Provide a schedule for an inspection program covering mechanical snuP ars produced by other manuf acturers. As a minimum, this inspection program shall:
a.
Include all snubbers installed on safety-related systems; Response 3a.
All mechanical snubbers installed on safety-related systems will be inspected during out next refueling cutage tentatively scheduled to commence in late September, 1981.
b.
Include the visual examination and manual test described in Item la below for all sntabers ;
(1.a) Perform a visual examination for damage and, without causing the system to be inoperable except as permitted by the facility j
technical specifications, verify that the snubbers have freedom of movement by performing a manual test over the range of the stroke in both compression and tension.
f II l
Response 3b.
3 Visual tests will be performed as described in station procedure 3.M.4-28.
/ O 0109010228 810811' PDR ADOCK 05000293 O
PDR.
CDETON EDISON COMPANY Mr. Boyce H. Grier August 11, 1981 Page 2 The location of ' ors mechanical snubbers makes it impossible during plant operation to as iss their accessibility for manual testing. Therefore, we cannot know J
.he manual testing will be possible in all cases without the modification, or removal of nearby equipment.
During the 1981 refueling outage, we shall manually test all accessible safety-related mechanical snubbers. We shall also assess currently impossible locations, and initiate the development of those modifications necessary to manually test those snubbers untestable at this time. The necessary modification, and the testing of these snubbers shall b, completed during the 1983 refueling outage.
Procedure 3.M.4-28 details visual and manual testing as follows :
Visual
- Inspect ion of physical condition.
- Verfiication that field welds attaching the rear bracket assembly to plant structure / support are intact.
Verification that the bolts attaching he forward bracket /
transition tube assembly to the arrestsr housing are tight and intact.
- Verification that the screws keeping the cylinder end plug on the arrestor end are secured.
- Verification that the retainer pins of the rear and forward bracket assembly are in good shape and the cotter pins keep-ing the retainer pin in place are in piace, i
- Verification that the retainer pin of the rear bracket is not tight fit in the spherical bearing of the arrestor end cap and that the spherical bearing is free to rotate.
- Recording the extension of the arrestor by noting the position of the arrestor housing on the number scale.
- Recording all unusual indications.
Manual
- Unusual indications (loose bolts, bent retainer pins, loose cotter pins, broken welds, etc.) be reported to the maintenance staf f engineer for corrective acion.
I
- Misoriented mechanical shock arrestor units will be readjusted
- Arrestor extension readings will be compared to the cold and hot settings listed on procedural form. Unacceptable units will be; operationally / functionally tested unless otherwise designated by the maintenance staff engineer.
[ LTpN EDirQN COMPANY Mr Boyce H. Grier August 11, 1981 Page 3
- The functional / operational test for the mechanical shock arrestor on the spot, is performed by the following:
Detach one end of the arrestor from its retaining fittings.
Manually extend and rctract the arrestor through its full stroke range.
Document the functional / operational test of the arrestor on procedural form.
If extension or retraction of the arrestor is not possible, the unit shall be disconnected for more elaborate testing.
c.
Snubbers which have been examined and tested in a manner < smparable to Item 3b above within the last twelve months may be exempted:
Response 3c.
N/A d.
Require the corrective action and evaluations described in Items Id and 2d below; (1.d) & (2.d)
If any failures are identified in Items la or Ib above, take corrective action and/to evaluate the effect of the failure on the system operability pursuant to the facility technical specifications for continued opcration.
Response 3d.
Corrective actions will be taken upon discovery of a failure, and an evaluation on system operability for systems requi ed during refueling will be made, e.
Be completed prior to the completion of the next refueling outage. Plants which are currently in a refueling outage should perform the visual examina-tion and manual test of inaccessible mechanical snubbers before resumption of operations unless some other basis for assurance of snubber operability is provided to the NRC.
Response 3e.
All testing on mechanical snubbers as described in our response to Item 3b will include inaccessible snubbers, and will be completed prior to startup from our next refueling outage.
ed3TGN EDlION COMPANY Mr. Boyce H. Grier Augus t 11, 1981 Page 4 1
In addition, we will submit the results of the inspections performed for Item 3 within 60 days after startup from our refueling outage. The report will contain the following:
3
- A description of the visual examina' ions and tests performed.
- Number of snubbers examined and teated. Grouping by manufacturer name, model number, and size.
- Number of failures identified; manufacturer name, model number, size, mode of f ailure, cause of failure, corrective action, snubber location, effect of failure on plant and system safety, and justification for cont iruing or res; ming operation.
We believe the actions as listed above are responsive to the concerns of the bulletin. Should you have any questions during your. review, please do not hesitate to contact us.
4 Very truly yours, M
cc: Director, Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 i
Commonwealth of Massachusetts)
County of Suffolk
)
Then personally appeared before me A. Victor Morisi, who, being duly sworn, did state that he is Manager - Nuclear Operations Support of Boston Edison Company, the applicant herein, and that he is duly authorized to execute and file the submittal contained herein in the name and on behalf of Boston Edison Company and that the statements in said submittal are true to the l
best of his knowledge and belief.
My Commission expires:
4
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