ML19221B084
| ML19221B084 | |
| Person / Time | |
|---|---|
| Issue date: | 03/31/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| NUREG-75-087, NUREG-75-087-10.4.2, NUREG-75-87, NUREG-75-87 10.4.2, SRP-10.04.02, SRP-SRP-10.04.02, NUDOCS 7907120391 | |
| Download: ML19221B084 (3) | |
Text
NUREG 75/087
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'l U.S. NUCLEAR REGULATORY COMMISSION
.+c STANDARD REV EW PLAN W4'y#\\..,*jOFFICE OF NUCLEAR REACTOR REGULATION SECTION 10.4.2 MAIN CONDENSER EVACUATICN SYSTEM REVIEW RESPC',SIBILITIES Primary - Ef fluent Treatment Systems Bra ch (ETSB)
Secondary - Nore I.
AREAS OF DEVIEW At the construction permit (CP) stage of revie.v, ETSB reviews the information in the applicant's safety analysis report (SAR) in the specific areas that follow. At the operating license (CL) stage ci review, the ETSB review consists of confirming the design accepted at the CP stage.
1.
The main condenser evacuation system (MCES) generally consists of two subsystems:
the " hogging" or startup system which initially establishes main condenser vacuum, and the normal system which maintains condensar vacuum once it has been established. The review of each MCES subsystem includes the design, design objectives, capicity, method of operation, and f actors that influence gaseous radia3ctive material hai.diing, e.g., system interfaces and potential bypass roi. te s. The ETSB review includes the system piping and instrumentation diagrams (P& ids).
2.
The quality group classifications of piping and equipment, and the bases governing the design criteria chosen are reviewed.
3 Design features to preclude tne possibility of an explosion if the potential for emplosive mixtures exists are reviewed.
Provisions incorporated to sample and monitor radioactive materials in gasecus effluents from the MCES are reviewed in SRP Sections l'.5 and 9.3.2.
l II.
ACCEPTANCE CRITERIA The applicant's design should meet the follo.ving criteria:
1.
The MCES capacity should be consistent witn the industry guidelines given in Reference 2.
Either mechanical vacuum pumps or steam jet air ejectors may be used for hcgging (startup) or normal evacuation of the main condenser.
USNRC STANDARD REVIEW PLAN
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2.
The components of the system may be designed to Quality Group D as defined in Regulatory Guide 1.26 (Ref. 3) and to a nonseismic design classification.
3.
If there is a potential that explosive mixtures may exist, the MCES should be designed to withstand the effects of an explosion or provide redundant instrumenta-tion to detect and annunciate the buildup of potentially explosive mixtures, as outlintd in SRP Section 11.3, II Acceptance Criteria, Item 6.
4.
Provisions to control and monitor releases of radioactivity to the environment from the "CES must conform to the requirements of General Design Criteria 60 and l
64 (Ref. 1).
III. REVIEW FROCEDURES The reviewer will select and emphasize material from this SRP section as may be l
appropriate for a particular case.
1.
In the ETSB review of the PCES, the P& ids are reviewed to determine the flow paths of gases through the system, including all bypasses, and the points of release of gaseous wastes to the environment or other systems. This information is used in SRP Section ?1.3 to calculate the quantity of radioactive material l
released annually in gaseous effluents during normal operations, including anticipated operational occurrences. ETSB verifies that water from the mechanical vacuum pumps and crndensate from th? steam jet air ejectors are classified as radioactive liquids and treated accordingly.
2.
ETSB reviews the equipment quality groap classifications.
3.
If there is a potential that explosive mixtures may exist, ETSB determines whether the applicant has designed the MCES to withstand the effects of such an explosion, or has provided instrumentation to detect, annunciate, and prevent j
the buildup of potentially explosiva niintures. ETSB will also determine if the applicant's desian includes adequate prosisjons to stop continuous leakage pathc.
after an explosion.
IV.
EVALUATION FINDINGS ETSB verifies that sufficient information his been provided and that tu -~/ i e w is adequate to sur? ort conclusions of the following type, to be included in the staff's safety evaluation report:
"The main condenser evacuation system includes equipment and instruments to establish and maintain condenser vacuum a.id to prevent an ur: controlled release of radiocctive material to the environment The scope of our review included thesystemcapabilitytotransferradioactivegasestothegaseouswasteprocessingl system or ventilation exhaust systems, the design provisions incorporated to monitor and control releases of radioactive materials in gaseous effluents in Rev. 1 10.4.2-2 1 j, G
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accordance with General Design Criteria 60 and 64 and the quality group classifica-tion of equiptrent and compone.nts used to collect gaseous radioactive wastes relative to the guidelines of Regulatory Guide 1.26.
We have reviewed the applicant's system descriptions, piping and instrumentatic, diagrams, and design criteria for the components of the main condenser evacuation system. The basis for ecceptance in our review has been conformance of the applicant's designs, design criteria, and design Dases frr the main condenser evacuation system to the applicable regulations, regulatory guides and industry standards referenced above. Based on our evaluation, we find the proposed main condenser eva uation system acceptable."
V.
REFERENCES 1.
10 CFR Part 50, Appendix A, General Design Criterion 60, " Control of Releases of Radicactive Materials to the Envirnnment," ana Criterion 64, " Monitoring Radio-activity Releases."
2.
" Standards for Steam Surface Condensers ath Ed, Heat Exchanger Institute (1970).
3.
Regulatory Guide 1.26, " Quality Group Classifications and Standards for Water,
Steam, and Radioactive-Waste-Containing Components of Nuclear Power Plants."
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