ML20043C901

Forwards Chapter 12 Responses to 900504 Request for Addl Info on Ssar for Advanced Bwr.Chapter 11 Responses Are GE Proprietary & Will Be Submitted Under Separate Cover

ML20043C901
Person / Time
Site:	05000605
Issue date:	05/31/1990
From:	Marriott P GENERAL ELECTRIC CO.
To:	Chris Miller Office of Nuclear Reactor Regulation
References
EEN-9025, NUDOCS 9006060323
Download: ML20043C901 (2)

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May 31,1990 MFN No.060 90 Docket No. STN 50 605 EEN 9025 Document Control Desk U.S, Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Charles L Miller, Director Standardization and Non. Power Reactor Project Directorate

Subject:

Submittal of Responses to Additionalinformation as Requested in NRC letter from Dino C. Scaletti, Dated May 4,1990.

Enclosed are thirty four (34) copies of the Chapter 12 responses to the Request for Additional Information (RAl) on the Standard Safety Analysis Report (SSAR) for the Advanced Boiling Water Reactor (ABWR). The Chapter 11 responses are GE proprietary and will be submitted under separate cover.

It is intended that GE will amend the SSAR with this response in a future amendment.

Sincerely,

)/

P. W. Marriott, Manager Regulatory and Analysis Services M/C 382, (408) 925 6948 cc: F. A. Ross DOE)

D. C, Scalett(i (NRC)

D. R. Wilkins (GE)

J. F. Quirk (GE)

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9006060323 900531 POR ADOCK 05000605 P PDC 07( I

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I OUESTION 471 42  ;

t EPRI.ALVR Requirement Document in Chapter 12: Radioactive Waste Processing .;

System (page 12.3 8), Section 3.2.1, Coal for CRWPS Radioactivity Releases states that:

• The total radioactivity of gases released from the plant (excluding the +

activity of released tritium) shall not exceed the following. values:

BWR: 2,000 curies per year; etc."

ABWR, standard plant, in Chapter 12. Radiation Protection, in Section 12.2.2.1 Production of Airborne Sources, last paragraph states that:

'Approximately 7,900 C1/ plant / year of noble radiogases are released; one.

half of this total is released from the turbine building..."

Please address this apparent discrepancy.

RESPONSE 471.42 The value for total offsite airborne release found in Chapter 12 Subsection .

12.2.2.1 has been changed from 7,900 C1/yr to 5,100 Ci/yr. The isotopic break.

down for this release is given in Tables 12.2 19 and 12.2 20. This value does not compare to the EPRI requirement of-2,000 Ci/yr from EPRI Chapter 12, para 3.2.1 for two reasons. The first reason is the EPRI requirements specify release of selected isotopes whereas the ABWR number is a total over all isotopes. Using the EPRI isotopic list for.the ABWR would result in a release of-3,700 Ci/yr. The second reason is the EPRI goal is based upon expectations from actual plant perforcance. The ABWR value is a more conservative evalua.

tion of potential performance based upon bounding fuel performance coupled with a conservative evaluation of the offgas system to remove and delay noble gas releases. The ABWR evaluation, however, is made not to compare to a goal for-release but as a conservative evaluation for determination of compliance to the?

requirements of 10CFR50, Appendix 1, on releasas to unrestricted areas.

As an example of such a difference in calculations for goals as compared to requirements, the ABWR assumes a source term of 15,000 pCi/sec (t-30 min delay) as the source term to the offgas system. In fact based upon data similar to that used by EPRI for BWR's with improved fuel and water chemistry technical

-specifications, the release value would run around 5,000 pCi/sec which, ignoring conservatisms in the evaluation of the offgas system, would result in a release comparable to the EPRI goal of 1,200 pCi/sec, l