ML20197H823

Forwards Instrumentation & Control Sys Branch Safety Evaluation Re Proposed Tech Spec Change to Delete Requirement for Verifying Control Room Annunciation.Proposed Changes Acceptable.Salp Input Encl

ML20197H823
Person / Time
Site:	Columbia
Issue date:	07/16/1984
From:	Houston R Office of Nuclear Reactor Regulation
To:	Novak T Office of Nuclear Reactor Regulation
References
CON-WNP-0761, CON-WNP-761 TAC-54443, NUDOCS 8407230345
Download: ML20197H823 (7)

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'JUL 161984 l'EMORANDUM FOR: Thomas H. flovak, Assistant Director for Licensing Division of Licensing FRO 1: R. Wayne Houston, Assistant Director for Reactor Safety Division of Systems Integration

SUBJECT:

ICSB REVIEW OF PROPOSED TECHNICAL SPECIFICATION CHANGES FOR WNP-2 Plant Name: UNP-2 Docket No.: M DESIGNATED ORIGINAL Licensing Status: OR ,

TAC No.: 54443 Responsible Branch: LB-2 Certified By t

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Project Manager: R. Auluck Review Branch: ICSB Review Status: Complete The Instrumentation and Control Systems Branch (ICSB) has reviewed the Washington Public Power Supply System (WPPSS) proposed Technical Speciff-cation change to delete the requirement to verify that control room annun-ciation occurs when the reactor building, turbine building, or rad-waste building intermediate range noble gas activity monitor indicates a measured level above the alarm setpoint as part of the associated quarterly channel functional test. The ICSB has also reviewed a pro-posed editorial change to the Technical Specification Limiting Condition for Operation for the source range monitor instrument channels. The proposed changes were requested by UPPSS letters G02-84-032 dated January 20,1984 and G02-84-285 dated May 4,1984 The ICSB has concluded that the proposed changes to t.he W!iP-2 Tech-nical Specifications are acceptable as described ,in the enclosed Safety Evaluation (Enclosure 1). The ICSB's assessment of licensee perfor-mance (SALP input) is provided in Enclosure 2.

l l It is noted that the licensee also originally proposed a Technical Spect-I fication change to delete the requirement to verify that control rool l

annunciation occurs on low detector voltage (i.e., high voltage abnormally l low) for the liquid radwaste ef fluent line radioactivity monitor as part of the associated quarterly channel functional test. The licensee's basis for this change was that no test point is provided to monitor de-l tector high voltage, and that disconnecting the hign voltage connector l at the drawer or preamplifier could result in shocking the detector into

Contact:

R. Kendall, ICSB X29451 L,, 407230345 840716 M /

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failure when the high voltaje is reconnected. However, based on sub-sequent discussions with tne ICS3, the licensee nas verbally cou.aitted to

.nodify the detector instruacnt drawer to allow the connection of test equip. lent which will pernit detector high voltatje to be varied without being disconnected. Therefore, the licensee will oe able to verify that control room annunciation occurs on "hi'jh voltage annomally Iv.v", and has agreed to the original IeChniCal Specification surveillance COQuire-nents (Table 4.3.7.11-1) for tae liquid radwaste ef fluent line radioactivity monitor. This is acceptable to the staff.

The "eteorology & Effluent Treatment 1; ranch (;!ETli) assisted the IC5b durin'j tnis review.

Original signed by R. Wayne Hoaston R. Wayne Houston, Assistant 6irector for Reactor Safety Division of Systems Integration

Contact:

D I S TR IB UT I 0ft :

R. iendall Docket File x29451 ICSB Rdg.

R. Kendall (PF)(2) cc w/ enclosures:

J. Calvo A. Schwencer C. Miller

!!. Gaimiill F. Rosa C. niller ADRS Rdg.

R. Auluck M. Virgilio

0. Hoffnan J. Mauck C. Tito.aas R. Stevens C. Patel J. Joyce R. Capra WflP-2 S/F s d.

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OFFICI AL RU~ CORD CbPY

i SAFETY EVALUATION WNP-2: PROPOSED TECHNICAL SPECIFICATION CHANGES (TAC 54443) gg;rJRMa En, va.u c ,

INTRODUCTION Cee.lfied By fi f 'hYm

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By letters G02-84-032 dated January 20, 1984 and G02-84-285 dated May 4, 1984, the Licensee (Washington PubLic Power Sup-i ply System) proposed the folLowing changes to the WNP-2 Technical Specifications.

(1) Delete the requirement to verify that control room an-.

nunciation occurs when the reactor building, turbine i building, or radwaste building intermediate range noble gas activity monitor indicates a high Level, as part of the associated quarterly channel functional test (pages 3/4 3-93, 94, and 95) and

'2) Change " audible indication" to " annunciation" for item 3.9.2b under the Limiting Condition for Operation require-ment for source range monitor (SRM) channels during re-fueling operations (page 3/4 9-3). Item 3.9.2b wilL now read "At least one with annunciation in the control room."

The staff's review of the Technical Specification change con-cerning the noble gas activity monitors (item 1 above) did not evaluate the WNP-2 design with respect to TMI Action Plan Item

I I . F .1.1 (Additional Accident-Monitoring Instrumentation; Noble Gas Effluent Monitor).

_ EVALUATION The radioactive gaseous effluent monitoring instrumentation channel alarm setpoints are set to ensure that spe c i f i ed re--

Lease limits (established in accordance with the offsite dose calculation manual, ODCM) are not exceeded. Table 4.3.7.12-1 (Radioactive Gaseous Effluent Monitoring Instrumentation Sur weilLance Requirements) specifies that a quarterly channel functional test be performed for both the low range and the intermediate range noble gas activity monitors in the main plant (reactor building) release path, the turbine building ventilation exhaust, and the radwaste building ventilation exhaust. One Low range and one intermediate range monitor is provided for each of these gaseous release paths. Each of the monitors provides an input to an indicator Located in the control room. The normal measured activity level is near the Low end of the low range indicator. The intermediate range indicator should read downscale.

The operators rely on the high Level alarm associated with the low range monitors to alert them of high activity levels in the gaseous effluent exhaust. FolLowing receipt of an alarm, the operator wilL take action, if appropriate, to ensure that the ODCM release limits are not exceeded. The licensee considers

the high activity alarm associated with th- intermediate range' monitor to be a nuisance alarm (i.e., it requires acknowledge-ment by the operators, but does not provide the operators with any new information since they are already aware of high gas-eous effluent activity Levels via the Low range monitor alarm).

There are no isolation or actuation functions performed by the intermediate range monitors. If the alarm associated with the low range monitor should fail, the Licensee can detect a high activity level from the control room indicators. The Licensee is required by the Technical Specifications to perform a ch a n-nel check of these indicators daily. An abnormally high gas-eous effluent activity Level, as welL as a failed indicator, should be detected by the channel check.

A quarterly channel functional test, excluding verification of control room annunciation on indicated high activity levels, wilL stitL be required for the intermediate range monitors.

The channel functional test wilL confirm that control room an, l nunciation is received upon circuit failure and when the i n --

strument controls are set in the "0FF" position. Quarterly i

channel functional tests, including verification that control I

room annunciation occurs on high activity Levels, are required for the Low range monitors. If a noble gas activity monitor becomes inoperable, the Technical Specifications stilL permit

! . effluent releases via the associated pathway for up to 30 days i

i provided that grab samples are taken at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> l and analyzed for noble gas gamma emitters within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

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CONCLUSION Based on its review, the staff has concluded that the i n t e r--

mediate range monitor alarm does not require further operator -

action beyond that taken in response to the Low range monitor alarm, and that sufficient instrumentation is available and periodically monitored.to detect a high activity Level should the Low range alarm fait. Therefore, the staff finds the Licensee's proposed Technical Specification change to delete the requirement for testing the intermediate range noble gas activity monitor high Level alarms, described above, to be acceptable.

The Licensee's proposal to change " audible indication" to

" annunciation" is a clarification of an existing Specifica--

tion consistent with the plant design and does not involve a significant hazard consideration, and therefore, is accept--

able.

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EtiCLOSURE 2 PREPARED BY Tile IllSTRutiENTATI0tt & C0t1 TROL SYSTEMS BRNICil PLAtiT: WNP-2 ',

SUBJECT:

TAC #54443 EVALUATI0ft PERf0Rt1ANCE 005Ib CRITERIA CATEGORY

1. Management Involvement N/A No basis for assessment.

A clear understanding of the issues was demonstrated by the licensee.

2. Approach to In general, the licensee's justification supporting the proposed Technical Resolution of 1 Specification changes was technically sound.

Technical Issues The licensee responded quickly with detailed technical information to staff

3. Responsiveness requests for information concerning the design of the noble gas activity 1 monitors and associated control room displays.

4. Enforcement llistory N/A No basis for assessment.

5. Reportable Events it/A No basis for assessment.

6e StaffinD N/A No basis for assessment.

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7. Training N/A No basis for assessment.

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