ML17139C930
| ML17139C930 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 02/15/1985 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML17139C929 | List: |
| References | |
| NUDOCS 8502250779 | |
| Download: ML17139C930 (6) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 SAFETY EVALUATION AMENDMENT NO.
TO NPF-14 SUS UEHANNA STEAM ELECTRIC STATION, UNIT 1 DOCKET NO 50-387 Introduction The licensee, in a letter dated September 19, 1984, proposed changes to the Technical Specifications of the operating license for Susquehanna Steam Electric Station, Unit 1 which are as follows:
a) changing 4.6. 1.7 part "c" to revise elevation and azimuth value to reflect the relocation of the drywell atmosphere temperature elements b)
. an editorial change to 4.6. 1.7 part "d".
The intent of the changes is to a) have the drywell atmosphere temperature elements more accurately represent the average drywell air temperature and b) to clarify the technical specification 4.6. 1.7 part "d".
Eva 1 uati on The primary containment a ir cool ing system cons ists of 14 unit cool ers, each having a ca pac ity of approximately 8650 CFM.
These units are 1 ocated around the reactor pressure 'essel in the lower section of the drywel 1 between el evati ons 704 'nd 7 14 '
rec ircu 1 ati on pump area).
The cooling units are connected to ductwork on the dischar ge s ide only ; ai r enters the cool ing units directly from the surrounding space.
The ambient temperature signal in the control rod drive
( CRD ) areas will automati cal ly s tar t the CRD standby unit cooler
( norma 1 ly only one is running).
A high temperature in any other portion of the drywel 1 will automatically start al 1 s ix ( 6 ) standby unit coolers. If the average ai r temperature in the drywel 1 cannot be maintained below the 1 imit of 135' with a 1 1 14 units, the reactor will be shutdown in accordance with the Technical Specifications.
The prima ry containment drywel 1 temperature monitoring system includes two redundant subsystems
, with each hav ing four. dual element type resistance temperature detectors
( RTDs ) located throughout the drywel 1.
Four of these e ight temperature elements have safety related functions.
The other four are used to obtain a representative average drywel 1 a ir temperature during normal plant conditions and, ther efore, are classified as non-safety related.
The Technical Spec ificati ons limit the average drywel 1 a ir temperature to 135' The average temperature is the ari thmeti c average of the highest 8502250779 850215 PDR ADOCK 05000387 P
,PDR I, ',
i temperature at a minimum of three (3) drywell elevations.
The reason for controlling drywell temperature is to assure that the initial containment conditions assumed in accident analyses (drywell temperature,
- pressure, humidity) are not exceeded.
The temperature monitoring, system,
- however, also serves other purposes (i.e., to permit control of environmental conditions for instrumentation, and in some cases to detect small leaks).
In Susquehanna, Unit I, as stated in the licensee's
- letter, two RTDs are located on elevation 711'n the recirculation pump area.
This area contains several hot {recirculation pumps and piping) and cold (cooling units) com-ponents.
All 14 cooling units draw air directly from this space.
An average temperature based on measurement from this region could be non-representative due to locally high temperatures.
The licensee proposed to relocate the two RTDs, at elevation 711'n the recirculation pump area to elevation 737'or use in calculating the average drywell atmosphere temperature, which is regulated through the Technical Specifications.
This relocation will assure more appropriate monitoring of the temperature zones.
Additionally, an editorial change was reviewed.
Prior to the proposal, on page 3/4 6-10 the azimuth values for c and d were inadvertently reversed.
In order to correct the Technical Specifications, the staff has approved the appropriate change.
Conc lus ion The proposed modification of the drywell atmosphere temperature monitoring system by the licensee is technically,iustified to obtain a representative average drywell temperature.
The modification does not involve any significant safety considerations.
We, therefore, recommend approval of the change to the Technical Specifications as proposed by the licensee.
Environmental Consideration This amendment involves a change in the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20.
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 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 consideration and there has been no public comment on such finding.
Accordingly, this amendment meets the eligibility criteria for categorical exclusion set forth in 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.
Conclusion
Me 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 this amendment will not be inimical to the common defense and security or to the health and safety of the public.
Dated:
FEB 15 $%
1
Issuance of Amendment No.
to Facilit 0 eratin Licence No NPF-14 Sus ue anna team ectr~c
- tation, nest 1
,=-
DISTRI BUTION NRC PDR Local PDR PRC System NSIC LB¹2 Reading EHylton RPerch NCampagnone TNovak JSaltzmen, SAB SGoldberg, OELD OMi les HDenton JRutberg AToalston WMiller, LFNB NGrace EJordan LHarman DBrinkman, SSPB TBarnhart(4)