ML20042G679
| ML20042G679 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 05/10/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20042G678 | List: |
| References | |
| NUDOCS 9005150279 | |
| Download: ML20042G679 (3) | |
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[>S Ftogko, UNITED STATES:
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- NUCLEAR REGULATORY COMMISSION -
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WASHINGTON, D. C. 20555
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED T0- AMENDMENT NO.108 TO FACILITY OPERATING' LICENSE NPF-9 AND AMEN 0 MENT NO. 90 TO FACILITY OPERATING LICENSE NPF-17 DUKE POWER COMPANY 00CKETS NOS. 50-369'AND 50-370 MCGU1RE NUCLEAR STATION, UNITS 1 AND 2 i
1.0 INTR 0 DUCT 10N By letter dated January 19,.1990 Duke Power Company (the-licensee) proposed amendments, to the operating licenses for McGuire Nuclear Station,) Units 1 and.
- 2. -The emendments would revise the Technical Specifications (TSs by:
(1) deleting an obsolete footnote and its associated reference from TS 3.7.6; (2) reducingtheallowableairtemperatureinthecontrol-room (3)pecifiedbyTS s
Surveillance Requirement 4.7.6.a. from 120*F to 90*F; and correcting the extent of methyl iodide penetration, specified in TS Surveillance Requirements j
4.7.f.c.2 and 4.7.6.d. for laboratory testing of charcoal; adsorbers of the.
control. area-ventilation system from less than 1% to less than 0.175%.
2.0 EVALUATION I
L 2.1 Deletion of Obsolete Footnote By Amendments 95 (Unit 1) and 77 (Unit 2), the NRC added a footnote to TS 3.7.6 granting a one-time extension of the outage time specified for the Control Room Area Ventilation Chilled Water. system to allow fan replacements-and associated system modifications.,The replacements and modifications have been completed and the footnote is no longer applicable. Removal of the.
footnote and the reference to it within the' text is purely an administrative change and has no adverse effect upon safety. The change.is, therefore, acceptable.
2.2 Reduction of Control Room Air Temperature The air conditioning portion of the Control Room Area Ventilation Chilled Water i
system is designed to maintain the control room temperature at about 75*F.
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- However, TS 4.6.7.a currently requires that control room temperature be q
maintained less than or equal to 120*F. Under the present limit McGuire has been occasionally experiencing erratic behavior and failures of certain solid l
state electronic components located in cabinets in the control room complex and associated with controls for safety systems and engineered' safety features.
The erratic behavior and failures occurred when control room air temperature was increased above 90*F.
To provide a higher level of reliability for electronic equipment in the control room area, the licensee proposes to revise the TS3 by reducing the present limit of 120*F to a more restrictive 90*F.
9005150279 900510 DR ADOCK 05000 f
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3 a The NRC staff has reviewed the licelisee's request and agrees that use of the.
lower temperature limit will provide a more favorable operating environment for systems and components-in the control room area, especially solid state electronic components. Moreover, lowering the allowable limit to'90*F will produce ~no adverse effect on safety. Therefore, the' proposed change is acceptable.
2.3 Penetration of Methyl Iodide During Testing of Charcoal Adsorbers On March 2, 1983, the NRC issued Generic Letter (GL) 83-13, " Clarification of Surveillance Requirements for HEPA Filters and Charcoal Adsorber. Units in Standard Technical Specifications on ESF Cleanup Systems." The GL provided model specifications to be followed in-the preparation of-' surveillance requirements for testing of high efficiency particulate air:(HEPA). filters 3
and charcoal adsorber units in atmospheric cleanup systems used as an engineered safety feature. The model addressed a, laboratory analysis of a t
carbon sample obtained:in accordance with, and required to meet testing criteria of, Regulatory Guide 1.52 for a certain upper 1.imit for methyl iodide senetration.
The GL explained the appropriate upper limit to be used for met 1y1 iodide penetration accordingly:
"0.175% value applicable when a charcoal adsorber efficiency of 99% is _
assumed, or.1% value applicable when a charcoal adsorber efficiency of 95% is assumed... in the NRC staff's safety evaluation."
4 The carbon filter beds of the McGuire Control Area Ventilation System are rated at a 99%' decontamination efficiency with respect to methyl iodide removal. - For such filters, periodic testing of carbon samples in accordance with Regulatory Guide 1.52 and TS 4.7.6 should be based upon methyl iodide penetration of-less than 0.175%.
Presently, TS-4.7.6.c.2 and 4-7.6.d specify a testing criterion for methyl iodide penetration of less than 1%, corresponding to a decontamination efficiency of 95%. The licensee calculates that the thyroid dose to control t
room personnel assuming a 95% decontamination efficiency would exceed the acceptance criterion of Standard Review Plan 6.4.
Therefore, the existing TS is not sufficiently conservative and should be corrected to-specify a methyl iodide penetration of 0.175%, the appropriate value for~a filter with 99%'
efficiency.
Accordingly, we find that the proposed change is appropriate to correct a 1
4 nonconservative error in the existing TSs regarding charcoal testing.
Moreover, the proposed change is consistent with the actual-design, the licensing basis for operator exposure and with GL 83-13.
It is, therefore, acceptable.
3.0 ENVIRONMENTAL CONSIDERATION
I These amendments involve changes in requirements,with respect to the installation or use of facility components located within the restricted area as defined in 10 CFR Part 20 and changes in surveillance requirements. The staff has determined that the amendment:: involve no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite and that there is no significant increase in individual or i-
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t cumulative occupational radiation exposure. The NRC staff has.previously i
issued a proposed finding-that the amendments involve no significant hazards consideration, and there has been no public comment on such finding. Accordingly, e
the' amendments meet the eli ibility criteria for categorical exclusion set 1
-forthin10CFR51.22(c)(9)g. -Pursuant to 10 CFR 51.22(b), no environmental assessment need be prepared in connection with the issuance of these amendments.
4.0fCONCLUSION The Commission's proposed determination that the amendments involve no signifi-cant hazards consideration was published in the Federal Register'(55 FR 8222) on March 7,1990. The Commission consulted with the State of North Carolina, No public comments were received, and the State of North Carolina did not have any comments.
We'have concluded, based on the considerations discussed above, that: -(1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner,-and (2) such activities will'be-conducted in compliance with the Commission's regulations, and the issuance of:
these amendments will not be inimical to the common defense and security or to' the health and safety of the public.
Principal Contributor:
D. Hood, PD#11-3/0RP-I/II 3
Dated: Mayl6, 1990 1
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