ML20055F334
| ML20055F334 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 07/09/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20055F333 | List: |
| References | |
| NUDOCS 9007160292 | |
| Download: ML20055F334 (2) | |
Text
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENMENT NO. 38 TO FACILITY OPERATING LICENSE NO. NPF-62 ILLIN0IS POWER COMPANY, ET AL.
CLINTON POWER STATION, UNIT NO. 1 DOCKET NO. 50-461
1.0 INTRODUCTION
Technical Specification 3/4.7.2 for the Clinton Power Station, Unit 1, governs the Control Room Ventilation System.
Surveillance Requirement 4.7.2.h. of that specification requires verification of minimal air inleakage to the negative pressure portions of the ventilation system ductwork and visual verification of the integrity of the flexible connection between the recircula-tion filter housing and the fan. The licensee proposes to add a specific equipment identification number to the designated fan.
2.0 EVALUATION The Control Room Ventilation System is designed to maintain a habitable environ-ment and to ensure the operability of all the components in the cont ~ol room under all the station operating and accident conditions. The basic system design includes a recirculation and filtration stage and a supply stage.
In the recirculation stage the ventilation discharge along with minimal make-up is driven by two 100% capacity return fans through the supply air filter package. This flow is then driven by the supply fans through the heating or cooling coils and into the control room ventilation areas.
By design the supply portion of the control room ventilation system maintains pressure slightly positive (0.125" water) to prevent air inleakage of unconditioned air.
Technical Specification Surveillance Requirement 4.7.2. currently states:
4.7.2 Each Control Room Ventilation System shall be demonstrated OPERABLE:
h.
At least once per 18 months by verifying that the air inh-okage rate into the negative pressure portions cf the Hain ContM Room Ventilation System ductnork located outside the Main Control Room habitability boundary betwen f an 0VC04CA(B) and 1:clat' ion dampers OVC03YMB) inclusive, and fire dampers OVC042YA(E), 0VC042YB(F), 0VC042YC(G) and yg 1,y> ; 5 6 j. _ 7,
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OVC042YD(H)tobe1650cfmwhentestedinaccordance
-with an NRC-approved test method.- In addition, visually verify the integrity of the Recirculation Filter Housing l
flexible connection.to the fan.
Theproposedamend'mentwillreplacethewords"thefan"'attheendofthe quoted passage with the words fanOVC03CA(B)." The intent of this surveillance requirement is to verify reasonable air tightness for those i
portions of the system that are normally maintained at a negative pressure.
The first part of the surveillance requirement clearly deals with the portion of the system on the suction side of the recirculation fans OVC04CA(B).
However,.the second portion of the-surveillance requirement is not clear as
-to whether'it applies to.the recirculation fans OVC04CA(B) or the supply fansOVC03CA(B). The intent should have been to perform the inspection of.
v the connection to the supply fans. Any inleakage at the recirculation ~ fans-y would have been identified in the first part of this surveillance. Therefore, an additional inspection on this fan would be unnecessary. Since the integrity of the system on the suction side of the supply-fans is not pressure tested, an inspection of this connection is appropriate.
In addition, any inleakage at the. supply fans would bypass the filter system and allow unfiltered air to enter the habitable boundary, making this inspection an L
important safety consideration. Based on the above, the pro)osed addition of the equipment identification number for the supply fans to t1e inspection portion of the surveillance is acceptable.
3.0 ENVIRONMENTAL CONSIDERATION
This amendment involves a change to a requirement with respect to the instal-lation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 or a change to a surveillance requirement. The staff has-determined that the amendment involves no significant increase in.
the amounts, and no significant change.in the types, of any effluents that 1
may.be released offsite and that there is no significant increase in individual or cumulative occupational radiation exposure. The Commission has previously issued a proposed finding that this amendment involves no significant hazards I
consideration and there has been no public comment on such finding.
Accordingly, l
thist amendment meets the eligibility criteria for categorical exclusion set I
forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b), no environmental
-impact statement or environmental assessment need be prepared in connection with the issuance of this amendment.
4.0 CONCLUSION
The staff has concluded, based on the considerations discussed above, l
^
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 (3) the issuance of this amendment will not be inimical to l
the common defense and security or to the health and safety of the public.
.l Prinicipal Contributor:
John B. Hickman, NRR o
Dated:
July 9, 1990 L
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