ML20215G169

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SER Finding Facility Design Acceptable W/Respect to Conformance to Reg Guide 1.97,Rev 3,except for Accumulator Tank Level & Pressure Instrumentation,Containment Sump Water Temp Instrumentation & Quench Tank Temp Instrumentation
ML20215G169
Person / Time
Site: Seabrook, 05000000
Issue date: 06/11/1986
From:
NRC
To:
Shared Package
ML20213F414 List:
References
FOIA-87-213, RTR-REGGD-01.097, RTR-REGGD-1.097 GL-82-33, NUDOCS 8706230147
Download: ML20215G169 (6)
v • d • e


Text

1 SAFETY EVALUATION REPORT SEABROOK STATION, UNIT N05. I AND 2 DOCKET N05. 50-443/444 .

CONFORMANCE TO REGULATORY GUIDE 1.97 INTRODUCTION AND

SUMMARY

Public Service of New Hampshire was requested by Generic Letter 82-33 to provide . 1

a. report-.to the NRC describing ~ how the post-accident monitoring instrumentation - q a

meets the guidelines of Regulatory Guide 1.97 as applied to emergency response- 1 facilities' . The applicant's response to Regulatory Guide 1.97 was provided by letter dated August 30, 1985 and' Revision 58 of the FSAR.

1 A detailed review and technical evaluation of the. licensee's submittals was perfonned by EG8G Idaho,'Inc.,'under contract' to the NRC, with general Jsuper-vision by the NRC staff. This work was reported by.EG&G in the Technical  :)q Evaluation Report (TER)', "Confonnance to Regulatory Guide -1.97, Seabrook Station, i Unit Nos. I and 2," dated May 1986 (attached). We have reviewed this report and concur with the conclusion that the licensee either conforms to, or has ade- 1 1

quately justified deviations from, the guidance of Regulatory Guide:1.97 for.- j each post-accident monitoring variable except for the variables accumulator tank level and pressure, quench tank temperature, and containment sump water temperature.

EVALUATION CRITERIA Subsequent to the issuance of the generic letter, the.NRC held regional meet--

ings in February and March 1983 to answer licensee and applicant questions-'and--

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concerns regarding the NRC-policy on Regulatory Guide 1.97.: fat these meetings.  !

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it was established that'the NRC review would only address exceptions'taken'to; the guidance of. Regulatory Guide > 1.97. Further, where licensees-or applicants -

8706230147 870618 d PDR FOIA e

.CONNOR87-213 PDRg. .

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explicitly state that instrument systems confonn to the provisions of the regulatory guide, no staff review would be necessary for those items. There-fore, the review perfonned and reported by EG&G only addresses exceptions tp  ;

the guidance of Regulatory Guide 1.97. This Safety Evaluation addresses the i l

licensee's submittals based on the review policy described in the NRC regional l meetings and the conclusions of the review as reported by EG&G.

EVALUATION l We have reviewed the evaluation performed by EG&G contained in the enclosed l

i TER and concur with its bases and findings. The licensee either. conforms to, or has acceptably justified deviations from, the guidance of Regulatory Guide 1.97 for each post-accident monitoring variable except for accumulator tank

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level and pressure, quench tank temperature, and containment sump water temperature. .!

For the variable boric acid charging flow addressed in section 3.3.2.5 of the EG&G TER, Revision 58 of the Seabrook FSAR provided a justification for its classification as a Design Category 3 variable as opposed to Design Category 2 in Regulatory Guide 1.97. This justification was not available to EG&G at the time they were conducting their review of this item. The justification states that emergency boration is not required in the mitigation of design basis accidents. The RWST provides the required volume of borated water for all design basis accidents. - Emergency boration may be used to assist-in the

recovery if available. Therefore, the monitoring of emergency boration flow'is classified as Design Category 3.

Because emergency boration flow is not a safety injection flow at this station, we find that classification of this variable as Design Category 3 is acceptable.

With regard to pressurizer heater status addressed in section 3.3.10 of the EG&G,TER, the applicant, in a letter dated May 30, 1986 provided a rev.ision to Table 7.5-1 which now indicates that this variable is categorized as Design Category 2. This is in accordance with the recommendations of R.G. 1.97 and I is therefore acceptable. '

With regard to the variable accumulator tank level and pressure addressed in section 3.3.7 of the EG8G TER, the applicant has provided a letter dated j l

June 6,1986 which commits to install an environmentally qualified accumulator j tank level or pressure instrument which meets the requirements for a Category 2 -

instrument contained in R.G. 1.97. Likewise the letter comits to install an )i environmentally qualified containment sump water temperature instrument which '

meets the Category 2 R.G.1.97 requirements. Containment sump water temperature 1

is addressed in section 3.3.17 of the EG&G report. The_ applicant commits to install these instruments prior to startup following the first refueling outage.

We find these commitments acceptable.  ;

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1 With regard to the. Quench Tank (Pressurizer Relief Tank) Temperature addressed 1

in section 3.3.11 of the EG&G TER, the applicant is supplying a temperature I

.l range of 50-250*F which deviates from the recommended. range of 50-750*F. His  !

1 justification is that the Pressurizer Relief-Tank (PRT) temperature measurement ]

is used in' conjunction with PRT level and pressure indication to determine if PRT conditions are " normal." He states that the temperature range provided is i

sufficient to indicate a change from normal ~ operating conditions, and fully i enveloping the. expected temperature to be encountered is not necessary in this case, l l

The applicant's justification is not acceptable. The applicant should show that the temperature indication will remain functional and on-scale, including the maximum expected saturation temperature, during any accident that lifts the-

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pressurizer relief valves, or provide a range that will envelop these conditions.

i CONCLUSION l

Based on the staff's review of the enclosed Technical Evaluation Report and the

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applicant's submittals, we find that the Seabrook Station, Unit Nos.'I and 2 j design is acceptable with respect to conformance to Regulatory Guide 1.97, .

Revision 3 except-for the accumulator tank level and pressure instrumentation, containment sump water temperature instrumentation, and quench tank temperature' instrumentation.

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The applicant's~ commitment to install a category 2 accumulator tank level or pressure instrument and a category 2 containment sump water temperature in-strument prior to startup from the first. refueling outage will bring the , ,

design of these. instruments into conformance with R.G. 1.97. We therefore find this comitment acceptable. . )

I For the quench tank temperature indication the applicant should show that the -

temperature indication will remain functional and on-scale, including the ' ,

maximum expected saturation temperature, during any accident that lifts the l

pressurizer relief valves, or provide a range that will envelop these conditions.  ;

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If an expanded range is necessary it should be installed before startup from the '

first refueling outage. ,

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