ML19309H614
| ML19309H614 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 04/15/1980 |
| From: | Andognini G BOSTON EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 80-65, IEB-80-03, IEB-80-3, NUDOCS 8005130562 | |
| Download: ML19309H614 (2) | |
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GENanAL omCEs SOo SOYLaTON STatr7 SosinN. MAssACNustTTs o2199 G. cANL ANOOSN0ND sUptRINTENQENT NuGLEAA cramAfeoNs casamTutNT April 15,1980 BECo. Ltr. #80-65 Mr. Boyce H. Grier, Director Office of Inspection and Enforcement Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA.
19406 License No. DPR-35 Docket No. 50-293 Response to IE Bulletin #80-03
Dear Sir:
In a letter dated Febraury 6, 1980, you tra smitted IE Bulletin #80-03 titled
" Loss of Charcoal From Standard Type II, 2 inch, Tray Adsorber Cells".
Boston Edison Company was requested to provide information pertaining to the charcoal adsorber cells in use at P11 grin Nuclear Power Station.
This information is provided as follows:
Charcoal Adsorber Cells Farr NPP-1 C-43060 Pilgrim Nuclear Power Station utilized Type NPP-1 Carbon Cells as manufactured by the Farr Company in both the Standby Gas Treatment System (SBGT) and the Control Room Environmental Filters (CREF).
Two 24" x 30" x 2" trays comprise the media retention portion of the filter cell and are of welded construction, which by design and fabrication (as described below) precludes the loss of charcoal even in the event of a failed weld.
The trays are fabricated in a manner such that the perforated screen extends t
under the lip of the casing.
Two filter tray sub-assemblies are mounted into a frame which is fastened with 5 (5/16 - 18") bolts.
Two trays and one frame complete a carbon adsorber cell. A total of 48 adsorber cells are used in the SBGT system and 6 adsorber cells are used in the CREF system.
Prior to in-itial installation, all the cells received an inspection equaling the current requirements of ANSI-N510-19.75 Section 5 applying the criteria set forth in Appendix A. A-5.
Inplace retesting has been in accordance with ANSI-N510-1975 Section 12 and was performed and found acceptable on each of the following dates:
Ec; TON EZCON COMPANY Mr. Boyce H. Grier, Director April 15,1980 Page 2 SBGT A
B Initial 11-17-77 8-4-77 Retest 5-11-78 5-11-78 11-21-78 11-22-78 5-16-79 5-17-79 11-8-79 11-13-79 CREF A
B Initial 2-2-74 2-2-74 Retest 4-14-76 4-14-76 5-18-79 5-18-79 Per installation design of the SBGT system, the horizontal surfaces of the adsorber trays are visible and therefore do not require removal for physical inspection.
Inspection results have shown no loose carbon to be in evidence on any of the horizontal trays, or at the base of the filter housings.
The overall cell con-dicion was observed to be free from sagging or other obvious deformities which would indicate a degraded condition. As an additional check, an inspection on the downstream HEPA filters was conducted resulting in no evidence of any charcoal particles or fines.
We believe this letter is responsive to your concerns.
Should you have any further questions please contact us.
j Very truly yours, cc: Nuclear Regulatory Commission Office of Inspectior. and Enforcement Division of Fuel Facility and Materials Safety Inspection Washington, D. C.
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