ML19345A771

Safety Evaluation Supporting Proposed Change 75 to Tech Specs

ML19345A771
Person / Time
Site:	Yankee Rowe
Issue date:	03/28/1967
From:	Skovholt D US ATOMIC ENERGY COMMISSION (AEC)
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ML19345A770	List: ML19345A769 ML19345A771
References
NUDOCS 8011250118
Download: ML19345A771 (20)

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{{#Wiki_filter:J i 9 SAFE'Y EVA1UATION BY THE RESEARCH AND PCWER REACTOR SAFETY BRMCH DIVISION OF REACTOR LICENSI?;G IN THE MAI'IEF CF YAL"KEE ATOMIC ELECTRIC COMPANY PROIOSED CHAICE NO. 75 DOCKET NO. 50-29 Ittroduction Pursuant to the provisions of Section 50 59 of the Commission's regulstions, Yankee Atomic Electric Company, in Proposed Change request No. 75, dated October 20, 1966, requested authorication to change the Technical Specifications attached as Appendix A to Lic2nse No. LPR-3 The proposed change vould specify the frequency of and acceptance limits for periodic testing of individual con-taincent penetrations and also integrated leakage rate tests of the containment. Discussion The present Technical Specifications for the Yankee reactor do not contain any pecific provisions for periodic integrated containment leakage rate tests or tectin of individual containment penetrations. To fulfill this requirenent, e Yankee has proposed specificaticns that follow the general guidelines used by the regulatcry staff in for=ulating leakage testing requiremente. These guidelines are presented in Attachment A of this Safety Evaluation. They specify the required testing schedule based upon the allowable leaka6e rate and contain-cent test pressure. Yankee has presented its analycis of the allowable containment leaka6e rate in YAEC-lC07, " Allowable Icakage from the Yankee Vapor Container," dated April,1965 Th3a report presents an analysis of en-site meteorological data collected ever a 10 month pericd. Based on this analysis, the limiting dose following the pcstu-lated maximum credible accident vould be the two hour thyroid dose at the site boundary (3100 feet). The guideline dose (300 Rem) recommended in 10 CFR 100 is conservatively calculated to result from a containment leakage rate of 31%/ds/ at the design pressure (34.5 psig), assuming the TID-14%4 release of radioactivity and the on-cite atmospheric diffusion parameters. We believe that these calculaticns are a reasonably conservative estimate of the maximum potential exposure. A*. intcGrated leakage rate test of the Yankee containment was performed in Auguet,1965 ani the leakage rate was determined to be O. LOC'%/ day with e. 95% confirience range of 0.026%/dayatthetestpressureof225psig. U on P consideration of the demonstrated performance of the containment and the cbjective to limit potential doses as much as practical, the staff believes that the maximam allovable containment leakage rate for the Yankee facility 8011250//[ [ ff

k should be 1.2%/ day at 34.5 psig under accident conditions. This corresponds to a leaka6e rate of 0.4%/ day under testing conditions and at the specified test pressure of 22 psig. This maximum operational leakage rate is defined as Lto (see Appendix C) and represents the leakage rate the containment must meet under the test conditions specified before reactor operation can continue. We believe that this allowable leakage rate and the testing frequency speci-fied in the proposed Technical SpecUications should permit containment inte-grity to be suitably maintained and limit the maximum potential off-aite dose following a major accident within acceptable limito. Technical Specifications To implcment this change, Section D.2.j should be added to the Technical Specifications as follows: D.2.j. Contain=nt Icakage Rate Retest Specifications "The specifications ubich define the minimum tests, acceptance criteria, corrective actions, and test frequency which shall govern the continued accept-ability of the reactor containment structure are described in Appendix C attached bereto." Conclusion We have concluded that the proposed change does not present si6nificant hazards considerations not described or implicit in the safety analysis report and that there is reasonable assurance that the health and safety of the public will not be endangered. f Origir.at SW h o.1. 9cha l Donald J. Skovbolt, Assistant Director for Reactor Operations Division of Reactor Licensing Date: gag 2 8 1967 l l

b C 6 ATTACH'yINT A REACTOR CONTAINMENT LEAKAGE TESTING.AND. SURVEILLANCE. REQUIREMENTS 1.0 CONTAINMENT TESTING AND SURVEILLANCE In recognition of the need.to provide evidence, during service, of the capability of a containment. system to perform its intended safety function, a program of testing and. surveillance is developed.* Because the leakage rate of containment system is a practical measure of its readiness to fulfill the. containment function, the integrated leakage rate test is considered.a principal and essential test (designated as a. Class A test). To justify the infrequent conductrof these. Class..A tests, a series of periodic surveillance tests- (designated. Class B and C tests) are suggested to monitor the principal sources of leakage development (penetrations and-isolation valves) during the service interval between integrated leakage rate tests. These-tests enable a suit-able program of maintenance and: repair.to be developed to control leakages within acceptable. limits. For those engineered safeguards systems.which are. relied upon to control or mitigate containment leakages under. post-accident condi-tions, a series of systems tests-(designated Class D test) are suggested. These tests are-intended to verify the capability of the systems to-function-(when needed) without loss of containment leak- / tight integrity. The test program suggests the performance initially of a preoperational leakage rate test (Class A test) at two pressure-levels-one, at the calculated maximum. peak. accident. pressure, and the<other,.at reduced pressure. -These.two. tests. measure the. representative-leakage charac-teristics of-the containment system.. Subsequently, at. periodic intervals, Class A tests may then be conducted at a single test pressure-the reduced test pressure. The reduced test pressure leakage rate test (Class. A. test) is justified by the conduct of-the more frequent surveillancet tests- (Class B and C tests) at a test pressure equal to the maximumncalculated peak accident pressure. These Class B and C tests provide the means to maintain the containment's leakage characteristics essentially as. initially deter-mined at the time of the preoperational.. Class.A test.

• This testing and surveillance program has4 evolved from a survey of containment leakage-characteristics"and reported-testing < experiences.

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.m A retest schedule is suggested which recognizes that the containment leakage potential and its consequences depend upon-the-magnitude of the containment calculated peak accident. pressure and.the design basis accident leakage rate as influenced by siting criteria. More j frequent testing is considered necessary where low leakage rates are specified because test experiences have shown the difficulty in maintaining such limits. ~ The retest schedule program provides for a graduated increase in the l~ interval between tests for the first three Class-A tests. During gg this period, the adequacy of the-test program can be evaluated by the a.c observed leakage behavior of the containment system.- The test fre-quency then seeks a level which is governed by the leakage measurements of the successive tests. Any laakage measurements which yield results

h; in excess of allowable test limits will indicate the existence of deteriorative service conditions or-inadequate maintenance programs g,

7 during the test interval. On the other hand, leakage measurements W-within limits will attest to the adequacy of the test program. The f(. test schedule reflects this flexible approach of allowing the observed leakage behavior of the containment system during service to dictate v' the test frequency. g I The allowable test and operational leakage limits (to be specified in the license) establish the acceptance criteria for-Class A tests. These limits ~are determined by adjusting the design basis accident leakage rate to reflect: the dif ferences between calculated accident and te.st conditions. A. further. adjustment is made. to account for / testing at pressures other than the calculated peak pressure of the design basis' accident. Following each Class A test, and before resumption of plant operation, the containment. leakage rate is inten-tionally decreased, by repairs if necessary,to provide a margin for any leakage increase which the containment system may experience in service. The margin is proportionally adjusted as the interval between Class A test is extended by-the test frequency schedule. 1.1 PURPOSE These minimum test requirements are intended to verify periodically the leak-tight-integrity of the containment' system, and to establish the acceptance requirements of each test. The purpose of the tests is to assure that leakage of the containment system is-held within allowable test limits and that the periodic surveillance tests assure proper maintenance and repair. i s

e e ~ 2.0 TEST CLASSIFICATIONS Four classes of tests are to be performed during the service life of 1, the containment system, namely: l}y, Class A Tests - overall integrated leakage rate measurements of the containment system under the "as is" service condition, at-the time py;f; IE of the test.

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IYj7 Class B Tests - local leak detection tests of. containment components ^"7 which penetrate, or: seal the boundary of the containment system. + f Class C Tests - individual local operability and leakage tests of d containment-isolation valves. Class D Tests - individual operability tests under Class A sist condi- .j tions of those engineered safeguard systems which influence ;ast Mnment leakage under post-accident. conditions. 1 4 3.0 CLASS A TEST REQUIREMENTS 3.1 Pretest Requirements - All Class A tests, other than the initial pre-operational test, are to be performed without.any preliminary leak-detection surveys and leak repairs except to meet.the requirements of Section 12.0. Major leak repairs are permissible provided the measured reduction in leakage thus attained-is added to the Class A test result. / All systems which, under post-accident conditions, become an extension of the containment boundary are.to..be vented.to.the containment atmo-sphere prior to the conduct of a.. Class A test. Closure of -the containment isolation valves is to be accomplished by L the normal mode of actuation and without any preliminary exercises or -Correction of closure malfunction is permissible provided adj us tmen ts. the reduction in leakage effected by the repairs is included in the Class A test result. 3.2 Test Methods - Tests employing'either the absolute pressure-temperature method or the reference vessel system in accord with the ANS-7.6 Standard * (or other method of demonstrated equivalency) are acceptable. The method chosen-for the initial test will normally be required for the periodic retests. ANS-7.6 Proposed Standard for Leakage Rate Testing of Containment Structures for. Nuclear. Reactors, October 31, 1966. )

b k The test duration is to be determined by the time required to yield meaningful results. The minimum test duration is to be not less than 24 hours unless test experiences of at least 2 prior Class A tests provide evidence of the adequacy of shorter test duration. The test accuracy is-to be verified by a supplementary means to demonstrate the validity of measurements. An acceptable means is suggested by ANS-7.6 i Standard. 3.3 Initial Leakage Rate Tests . Af ter completion of containment construction and installation of all systems penetrating the containment boundary, the initial preoperational integrated leakage rate tests are to be conducted at two pressure levels in the order specified: the maximum peak pressure calculated for the desikn(basis accident At 100% maximum containment operating pressure, P corresponds with a. l analyses). b. At pressure P, not less than 50% maximum containment operating l pressure P. g The leakage characteristics yielded by measurements L and Ltm, estab-lish, by the method outlined in Fig. 1, the maximum aSiowable test t be leakage rate L,, and the allowable operational leakage rate Lto specified in t5e license, for subsequent leakage rate tests. 3.4 Allowable Operational Leakage Rate - The allowable operational leakage rate L establishes the' limit to be met before placing the containment go f into service and before resumption of plant operation following each Class A test. As an acceptance criterion, the measured leakage rate L initial test (see hEg. 1). Repairs or L, for retests is to equal or be less than L, il the acceptance g and retests are to be performed,aif necessary, unt criterion is met. 3.5 Periodic Leakage' Rate Tests - Subsequent integrated leakage rate tests are to be conducted at a single test pressure P of Section 3.4(b) and t both of the following acceptance criteria are to be met. 3.51 As an acceptance criterion, which governs retest. schedule only, the is not to exceed.the maximum. allowable test measured leakage rate L,ined under Section 3.3.. leakage rate L as determ If the measured g leakage rate L exceeds L, a revision of the retest schedule revision asrequiredby"Section7.I2istoapply. If L exceeds L at the 1 year test interval, the margin.between L g g and,L, limits established by Section 3.3 shall be increased by the g difference between L and L,. t

(; As an acceptance criterion to be met, before resumption of plant 3.52 operation, the leakage rate, either as measured or following repairs and retests, is not to exceed the allowable; operational leakage rate L as determined in Section 3.4 If repairs are. necessary to meet the, acceptance criterion, the inte-grated leakage rate test need not be repeated provided local measured reductions in leakages achieved by repairs, reduce the overall measured integrated leakage rate to a value not in excess of the allowable operational leakage rate L gg 4.0 CLASS B TEST REQUIREMENTS Class B tests are to be perf ormed to detect or measure local leakages 4.1 originating at the following containment. components: Containment penetrations whose design incorporate resilient seals, a. gaskets, or sealant compounds; piping penetrations fitted with expansion bellows; Air lock door seals, including operating mechanisms and penetrations b. with resilient reals which are part of the-containment boundary in the air lock structure. Equipment and access doors with resilient seals or gaskets (seal c. welded doors are excluded);' containment steel-to-concrete junction / flexible seals. Components other than a, b, or c, which develop leaks in service d. and require repairs to meet the acceptance criterion of any Class A test. Acceptable alternate means of performing Class B tests include: Examination of the pneumatically pressurized test chamber (provided for this purpose) of components by the soap bubble or the halide a. leak detector. Measurement of the rate of pressure loss of the pneumatically b. pressurized test chamber of the containment component. Surveillance of leakage by a permanently installed system having c. provisions for individual or group pressurization of containment penetrations or seals, and measurement of pressure-loss (or flow of air through. leak paths). Other methods of demonstrated equivalency to a, b, or c. d. Tr m

h 4.2 Test Pressure - All Class B tests are to be-performed.by local pneumatic pressurization of the containment components, either individually or in groups, at a pressure not less than 100% maximum containment operating pressure P. 4.3 Acceptance Criterion - Repairs and retests are required when the leakage rate of all Section 4.1 containment components tested yields an average leakage rate per. 24 hours per component in excess of 0.1% of L. Repairs of lesser leaks are optional. P 4.4 Alternate Tests - Containment systems in which all of the components as defined under Section 4.1 are not~ fitted with means to enable Class B testing are to be subjected instead to the performance of a Class A test in accord with Section 3.5 at intervals specified under Section 7.22 except that the test pressure is to correspond with Section 4.2. 5.0 CLASS C TEST REQUIREMENTS 5.1 Class C tests are to be performed to verify operability and leak-tight-ness of those-isolation valves on lines which penetrate the containment a boundary and perform a containment function, i.e., Valves which communicate directly with the outside atmosphere a. (includes vacuum relief valves). b. Valves which, in the event of valve leakage or valve malfunction f upon-isolation signal, may extend the containment-boundary beyond that included during the conduct of Class A tests. Valves which, under post-accident containment isolated conditions, c. are not expected co be maintained continually at system fluid pressures equal.co or greater-than-the containment maximum operating pressure P. Valve Operability Tests -- Valve operability tests are to be conducted 5.2 prior to leakage tests to demonstrate proper closure of normally open valves (or opening and closing of normally-closed valves) upon-isolation signal. Where complete valve motion.(complete. closure,or opening) is impractical-during plant operation, partial exercising of the valve is acceptable. Valve malfunctions are to.be corrected and reported with each Class A test report.

7 5.3 Valve Leakage Tests - Isolation valve leakage tests are to be performed by local pressurization (or other equivalent means) at a pressure not less than 100% maximum containment. operating. pressure P, and by employ-p ing any of the test methods applicable to Class-B tests to detect leaks. Where valve seal-water systems are provided, the operation of the system is an acceptable alternate test. 5.31 Acceptance Criterion - Repairs and retests are required whenever the leakaga rate of any valve tested yields an equivalent leakage rate per 24 hours in excess of 1% of L. Repairs of lesser leaks are optiona2. P 6.0 CLASS D TEST REQUIREMENTS 6.1 Class D tests are to be performed to demonstrate the system operability (in accordance with dssign specifications).of those engineered safe-guards systems (e.g., containment spray, containment air cooling, etc.) which, under post-accident conditions, are relied upon to limit or reduce directly or indirectly the consequent leakage from the containment. The mode of operation of each system may be modified to the extent necessary or practical to enable operational testing of the system or -its components, Such tests are to be conducted initially.in conjunction with the preoperational leakage rate test, under the pneumatically pressurized condition of Section 3.3 a. Subsequent tests may be performed at normal ambient con'ditions. -System malfunctions are to be corrected.and. reported with the Class A / test results. 7.0 CONTAINMENT PERIODIC RETEST SCHEDULE 7.1 Class A Retest Schedule consecutive intervals After the initial preoperational leakage rate test, 7.11 between tests are not to exceed the schedule of the table in Figure 2 i for the applicable classification provided the acceptance criterion of Section 3.51 (first sentence) is met. In the event the measured leakage rate of any Class A test (including 7.12 leakage rate reductions effected by leaks repaired either directly prior to or during the test) exceeds the maximum allowable test leak-age rate, L the test schedule for successive tests returns to the beginning ok,-the sequence of-intervals of the. applicable classification shown in the table of Fig. 2. m

?i 7.2 Class B Retest Schedule ] 7.21 At least two Class B tests (except for. air locks) at approximately equally spaced intervals are.to be performed.during.the interval bet'- ween any scheduled Class A test, but no Class B test interval is to increase-beyond-l year. Air locks are to be tested at 4 month intervals irrespective ~of the-Class B. test schedule except when air locks are not opened during this interval,.in which dase, tests are to be performed after each opening, but no interval.is to increase beyond 1 year. 7.22 If Class-B tests are not practical (e.g., containment vessels not fitted with component test provisions), Class A tests are to be per-formed at-intervals not greater than-1 year-for the contaf6 ment service lifetime-(or until such time when modifications are made to enable Class B testing). 7.3 Class C Retest Schedule 7.31 Valve operability and leakage tests of isolation valves defined by Section 5.1 a, are to coincide with the schedule of Class B tests. 7.32 Valve operability and leakage tests of isolation valves defined by Section 5.1 b and c are to be performed during a scheduled Class A test or during other plant shutdowns to achieve at least one test per year. / 7.4 Class D -Retest Schedule 7.41 Class D tests are to be conducted.during each scheduled Class A test or other plant shutdowns to achieve at least one test per year. 7.5 Test Interval Allowance - Class A test schedules may be varied by not ( more than 6 months to coincide with scheduled or unscheduled plant I shutdown periods. 7.6 Permissible Periods for Testing 7.61 The performance of Class A tests is to be limited to periods when the plant facility is'nonoperational and secured in the shutdown condition under administrative. control and safety procedures defined in the license. 7.62 Prior to pressurization for and during the performance of any Class A the containment atmosphere-temperature is to be maintained such

test, that the lowest service metal temperature of pressure retaining components is at least 30*F above the maximum value of the ductile britt1'e transition temperature (NDTT) of the containment's construc-l tional steels.

k. 8.0 CONTAINMENT MODIFICATIONS Any major modification or replacement of components of the containment system performed after the initial preoperational leakage rate test is or a Class B test to meet the to be followed by either a Class A test, acceptance criteria of Section 3.51 and Section 4.3 repsectively. Modifications or replacements performed directly prior to the conduct of a Class-A test need not require a separat,e test. 9.0 CONTINUOUS LEAKACE MONITORING SYSTEM A continuous leakage monitoring system is acceptable as a supplemental means (but not in lieu of Class A tests) to measure or detect chang'es 9.1 is not in containment leakage rates provided the average. pressure P Icss than 10% of P

• t The operation of a continuous leakage monitoring system may serve to 9.2 leak-tight integrity during plant operation to monitor the containment avoid exceeding leakage limits which,"if undetected, may lead to a reduction in Class A test intervals as required by Section 7.12.

of the monitoring system, when The leakage rate measurements-L 9.3 compared with the leakage rate f* of the initial Class A test, (see Fig.1) for establish the allcwable operationEl leakage rate L .The value, L, is to subsequent operation of-the monitoring system. s be reverified with each subsequent Class A test performed by com-measurement taken directly-before-the Class A test with f parison of-L the measured Eeakage rate L,, and revised if necessary. t Each subsequent measured leakage rate L derived from operation over a period sufficient to. yield meaningful"Eesults may not exceed the In the event this limit is exceeded, allowable test leakage rate L,. Class B tests and corrective repairs are required until the subsequent measured leakage. rate L, meets the acceptance criteria. 10.0 MULTIPLE-VESSEL CONTAINMENTS Multiple interconnected containment. vessels are. considered as a single containment in the performance of Class A tests. 11.0 MULTIPLE. BARRIER CONTAINMENTS Containment systems.with several leakage barriers are to be subjected to Class A tests.to. verify separately thattthe' measured leakage rate is not in; excess of. allowable test leakage. rate specified for each barrier.

) b. -12.0 ANNUAL INSPECTION A detailed visual examination of the accessible interior and exterior of the containment structure and its components is to.be. performed annually and prior to any. Class A test, to uncover any evidence of deterioration which may affect either the containment's structural integrity or leak-tightness. The discovery of any significant deterioration must be accompanied by corrective actions in accord with acceptable procedures, nondestruc-tive tests and inspection, and local-testing where practical, prior to the conduct of any Class A test. Such repairs are to be reported as part of Class A test results. l 13.0-REPORT OF TEST RESULTS Each Class-A test is to be the subject of a summary technical report, which includes a schematic arrangement of the leakage measurement system, the instrumentation employed, the test procedure, test results in graphical form, and the analysis and interpretation of-leakage rate results in meeting the allowable-leakage. rates-specified.in the license. Summaries of Class B, C, and D test results as may be specified under the respective. sections -are.to be included in the same report. / l l l L . m._ am..

i 1 . Fig. 1 - Determination of Allowable Leakage Rate Limits Applicable to Containment Testing L N Limit of leakage rate under O Limits to be specified in ldesignbasisaccidentconditiona technical specifications P Limit of allowable test _ leakage I rate under test conditions 0 5 s .= J. V .s l Margin for leakage h f / I deterioration L d / L 8 / to Initially measured leakage rates. t l s/ g x / E / mO ' / oL I = l I I l l P P P m t p Containment Pressure, psig / The leakage rate limits are established from the following relations: 1. Maximum allowable leakage rate at pressure P. .P (R Tpp/RT) l L ^ L = aa P a 2 Allowable test leakage rate L at pressure P, t e esser of l t p (P /P)2 and L P (Ltm / Lpm) L t p l Allowable operational leakage rate L at pressure P 3. g L (1 - g) from Table 1 selec,t g L, = g g 4 Allowable test leakage rate L of monitoring system (if provided) at pressure P, f (L, / Im) L L, g l l m

I C 7 _12-Notations and Definitions P containment vessel de' sign pressure. d maximum containment operating pressure (calculated peak pressure) P which may be imposed upon containment vessel as determined from P the safety analyses of design basis accidents. containment vessel test pressure selected to measure the inte-P grated leakage rate for successive tests. t average containment atmosphere pressure maintained during the P operation of a cont'inuous leakage monitoring system design basis accident leakage. rate at pressure P, applied in L P the safety analyses to evaluate the consequences of contain-leakage, under the calculated design basis accidents ment conditions in accord with the site exposure guidelines set forth in 10 CFR 100. maximum allowable leakage rate at peak pressure P, under the L test conditions of the containment air atmosphere? P maximum allowable test leakage rate at pressure P. defining L the limit governing retest schedule requirements allowable operational leakage rate at pressure P, defining g L the-limit for both; initial measurement L and subsequent measurements L,, at the outset of jlant operation following a Class A test. and P f the initial measured leakage rates at pressure P L ,L respectively. measured leakage rate of any. subsequent integrated leakage rate L test at' pressure P. g measured leakage rate-derived from operation of continuous L leakage monitoring system at pressure P (ave). allowable operational leakage rate defining the acceptable L limit of leakage rate measurements yielded by continuous s leakage monitoring system with respect to-leak repair requirements. under absolute temperature *R coincident with pressure PE T,T a p accident and test conditions respectively. equivalent gas constant of the containment atmosphere mixture R,R a p or-composition under acciden: and test conditions respectively. Leakage. deterioration allowance factor applied to obtain L* A (see Table 1) for the appropriate retest schedule limit classification. _______________________m___

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-.4 (, Leakage Deterioration Allowance Factor Ag 4 Table 1 -- m Schedule Preoperational 1 year 2 year 3 year 4 year 5 year Retest Interval Interval Interval Interval j Interval ~ Classification Test I 0.10 0.10 II 0.10 0.20 0.20 III 0.10 0.20 0.30 0.30 0.40 IV 0.10 0.20 0.40 1 0.50 O.50 V 0.10 0.30 / 1 b

1 J L C APPENDIX C_ CONTAINMENT LEA AGE RATE RETEST SPECIFICATIONS FOR YMEEE ATOMIC ELECTRIC COMPANY, HOWE. MASSACHUSET'TS A. Containment Periodic Testing Ihe following specifications define the minimum tests, acceptance criteria, corrective actions, and test frequency which shall govern the continued acceptability of the containment vessel to perform its function durin6 its service life. B. Class A Tests - Containment Integrated Leekage Rate Test 1. Tests The integrated leakage rate test shall be performed at a pressure of 22.0 1 2.0 poig without sny preliminary leek detection surveys or leak repair; immediately prior to or during the test. Leek repairs, if necessary to enable Class A testing, shall be preceded by local leektge measurements, and the leakage rate difference, prior to end after repair, added to the integrated leakage rate result of the Class A test. Closure of the containment isolation valves for the purpose of the test shall Fe accomplished by the means provided for normal opere. tion of the valves. The test daretion shall be not less than 2h hours for integrated leakage rate measurements, and shall be extended for a sufficient period of time to verify, by a superimposed controlled leakage (or other methods of equivalent sensitivity), the validity and accuracy of the leakage rate results. 2. Acceptance Criterie The maximum alloveble leakege rate, L, shall not exceed 0.7 veight t percent of the contained air per 24 hours et the test pressure defined in B.l. The allowable operational leakege rete, Lto, which shall be met prior to resumption of power operation (either as measured or following repairs and retests), shall not exceed 0.h weight percent of the contained air per 2h hours at the test pressure defined in E.1.

. 3 Corrective Action If leak repairs are necessary to meet the allowable operational the integrated leakege rate test need not be leakege rate, Lto, repeated provided local leakege measurements are conducted, and the leakage rate differences prior to and after repairs, when deducted from the integrated leakage rate measurement, yield a leakege rate value not in excess of the allowable operational leakege rate, Lto* h. 7[est FYequency L. The nominal consecutive interval between Class A tests shall be 48 months provided the leakage rate Lt of Criterion B.2 is met. b. In the event that the leakege rate Lt of Criterion B.2 is not met in any Class A test, the nominal interval between the next two tests shall be 12 months and 2h months before returning to the test frequency of E h.e. c. The above time intervals may be revised by not more then 9 months if necessary to coincide with plant shutdowns. C. Class E Tests - Individuel Leak Detection Tests 1. Tes ts Leak detection tests shall be locally performed at a pressure of not less then 3h.5 psig, using soap-bubble technioues, pressure decay meerurements, or other methods of equivalent sensitivity, on the following containment components: a. Containment penetrations with resilient seals, gaskets, or seelant compounds (except equipment hatch). For electrical penetrations, refer to C-5 b. Air lock door seals including air lock penetrations, c. Other containment components, besides C-1.e and C-1.b, which required leek repair following any Class A test to meet maximum allowable leakage limit L - t 2. Acceptence Criterion The average permissible leak flow rate per penetration derived from all Class E tests shall not exceed 1.8 lbs. of air per 2h hours. f l

P h k 3 Corrective Action Leaks which exceed the acceptance criterion of (C.2) shell be repaired and retested until the acceptance criterion is met. Repairs of lesser leaks are optional. k. Test Frequency Class 3 tests shall be performed at least twice between scheduled Class A tests, but, in any case, to satisfy this requirement no more frequently than once in any 12 months (plus 9 month interval allowance, if required to coincide with plant shutdown). 5. Electrical Penetrations Approximately 25% of the electrical penetrations shall be tested in each Class B test. If more than 10% of those tested show leakage, in excess of the limits presented in paragraph C.2. above, all e.'ectrical penetrations shall be tested. D. Class C Tests - Containment Isolation Valve Tests 1. Tests j Isolation valves installed on lines penetrating the containment boundary, which co=municate directly.with, or provide.an indirect leakage route via the -piping to, the outside atmosphere shall be cubjected to valve closure and leak detection tests to verify- . operability and sealing capability. Isolation valves including normally closed valves shall be exercised by the means provided for normal' actuation, prior to the performance of a leak detection test. Isolation. valve leak detection tests shall be conducted at'a minimum l of 34.5 psig and employ the -pressure' decay method _ of Lleak-rate measurement or other; methods of equivalent sensitivity. 2. Acceptance Criteria l l . Proper operability and_ sealing capability;shall be demonstrated by-the-valve closure test, i The average permissible leak flow rate through individual isolation ~ -va ves as est mated by the local' test, shall.not exceed 18 lbs. of f. l i [ air per 2h hours or' equivalent. l

i i t _ 4 3 Corrective Action Velve melfunctions disclosed by any Claes C test shall be corrected and reported in Ibe subsequent Class A test report. Leaks which exceed the acceptance criteria of (D.2. ) shall be repaired and retested until the acceptance criterion is met. Repairs of lesser leaks are optional. k. Test Frequency Class C tests shall be performed at least twice between scheduled Class A tests, but, in any case, no more frequently to satisfy this requirement than once in 12 months (plua 9 month interval allowance, if required to coincide with plant shutdown). 5 Test Exceptions If it can te demonstrated that a normally closed valve during plant operation routinely holds a pressure in excess of 35 psig, Class C tests shall not be required. E. Permissible Periods for Testing The performance of Class A tests shall te limited to periods when the plant is in the cold, shutdown condition, under administrative control, in ac-cordance with safety procedures as specified in the technical specifications. The containment etmosphere et any location within the vessel shall be maintained at a temperature of 60 F or higher during the performance of 0 any Class A test. F. Report of Test Results Class A tests shall be the subject of a summary technical report, which includes a schematic arrangment of the leakage measurement syste=, the instrumentation employed, the test procedure, test results in graphic form, and the analysis and interpretation of results. Summaries of Class E and Class C tests and periodic leakage rates of the monitoring system as performed during the interval preceding the scheduled Class A test are to be included in' the same report.}}