ML20031F864
| ML20031F864 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 10/15/1981 |
| From: | J. J. Barton METROPOLITAN EDISON CO. |
| To: | Barrett L Office of Nuclear Reactor Regulation |
| References | |
| LL2-81-0246, LL2-81-246, NUDOCS 8110200493 | |
| Download: ML20031F864 (3) | |
Text
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't Me'ropolit.m Edison Company e r ----- u r,
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l Post Of fice Box 480 4,
J M.ddletown, Pennsylvania 17057 Wnter's Direct Dial Number Ci
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October 15, 1981 m
,9 LL2-81-0246 E'.
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Mr. L. H. Barrett, Deputy Program Director w
ff U. S. Nuclear Regulatory Commission B
C' c/o Three Mile Island Nuclear Station Middletown, Pennsylvania 17057
Dear Sir:
Three Mile Island Nuclear Station, Unit 2 (TMI-2)
Operating License No. DPR-73 Docket No. 50-320 Recovery Operations Plan Change Request No. 9 Auxiliary Building Air Cleanup System Flowrate Enclosed please find the subject document. The submittal is made to request temporarily modifying the required flowrate for the Auxiliary Building Air Cleanup System. This change will provide additional operational flexibility without having any adverse effect on the health and safety of the public.
Eh er e--
m J. J arton t g Director, TMI-2 JJB:JJB:djb Attachment ec:
Dr. B. J. Snyder, Program Director, TMI Program Office l oO I 61I &
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DR ADOCK 05000 Metropohtan Edison Company is a Member of the General Pubhc Ut& ties System
m Three Mile Island Nuclear Station, Unit 2 (TM1-2)
Operating License No. DPR-73 Docket No. 50-320 I.
Recovery Operations Plan Change Request No. 9 The licensee request that the attached page 4.9-1 be substituted for the existing 4.9-1 in the TMI-II Recovery Operations Plan as a tc=porary change until a permanent change based on a detailed review of system design flow can be completed.
II.
Reason for Change This change is requested in order to reflect our preliminary review of Auxiliary Building Air Cleanup System Design. Additionally, it also incorporates the flow rate flexibility of 10% allowed in the standard Technical Specifications.
III.
Safety Evaluation Justifying Change Ventilation System flow rates are generally specified with a'i 10%
tolerance and are based on flow rates through the HEPA filters.
Flow rates are also normally established at approximately 1000 CFM/
filter and as the Auxiliary Building Air Cleanup System contains sixty (60) filter units a required flowrate of 63,000 CFM i 10% is c
consistent with this. Additionally, our preliminary review indicates that this flowrate will be sufficient to maintain 0.125 inches of water negative pressure in the Auxiliary Building and,therefore all exhaust air flow from the building will be via the Auxiliary Building Air Cleanup System and thus does not degrade the original cystem design intent. Therfore, this change will not affect the margin of safety in the bases of the Recovery Operations Plan, rcr will it increase the probability of occurrence or the consequences of an accident or malfunction of equipment important to safety previously evaluated, nor will it create the possibility for an accident or malfunction or a different type than any previously evaluated.
- w SURVEILLANCE REQUIREMENTS 4.9 LIQUID RADIOACTIVE WASTE STORAGE-FUEL HANDLING BUILDING /AUXILI ARY BUILDING AIR CLEANUP SYSTEMS 4.9.12 The fuel handling building air cleanup system and the auxiliary building air cleanup system shall be demonstrated OPERABLE:
At least once per 31 days by initiating, from the control room, flow a.
through the HEPA filters and charcoal adsorbers and verifying that each filter train operates for at least 15 minutes, b.
Initially and at least once per 18 ranths or (1) after any structural maintenance on the HEPA filter or charcoal adsorber housings, or (2) following painting, fire or chemical release in any ventilation zone communJcatingwiththesystemby:
1.
Verifying a flow iate of 23,000 cfm + 10% for each fuel handllng building exhaust filter train when tested in accordance with ANSI N510-1975.
2.
Verifying a flow rate of 36,000 cfm + 10% for each auxiliary building exhaust filter train when tested in accordance with ANSI N510-1975.
c.
At least once per 18 months by:
1.
Verifying an exhaust flow rate of at least 36,000 cfm for the fuel handling building air cleanup system with two fuel handling building supply fans and two fuel handling building exhaust fans in operation.
l 2.
Verifying an exhaust flow rate of at least 65,000*cfm for the auxilia.y building air cleanup system with two auxiliary building supply fans and two auxiliary building exhaust fans in operation.
3.
Verifying that the pressure drop across 'he combined HEPA filters and charcoal adsorber banks of hath fuel handling building filter train is loss than 6 inches Water Gauge while it operates at a flow rate of 23,000 cfm i 10%.
4.
Verifying that the pressure drop across th.e combined HEPA filters and charcoal adsorber banks of each auxiliary building filter train is less than 6 inches Water Gauge while it operates at a flow rate of 36,000 cfm i 10%.
- May be 63,000 CFM 10% until February 1, 1982.
THREE MILE ISLAND - UNIT 2 4.9-1 Change No. 0 r--
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