ML20093M610
| ML20093M610 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, 05000000 |
| Issue date: | 10/18/1984 |
| From: | Tramm T COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 9349N, NUDOCS 8410230044 | |
| Download: ML20093M610 (54) | |
Text
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,,... (~N Commonwealth Edison -
) one First Nation 11 Plazt, Chicago, tilinois
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7 Address R; ply to: Post Offica Box 767 j' Chicago, Illinois 60690 October 18, 1984 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear. Regulatory Commission Washington, DC 20555-Sub ject: Byron Generating Station Units 1 and 2 Braidwood Generating Station Units 1 and 2 HVAC Systems NRC Docket Nos. 50-454/455 and 50-456/457
Dear Denton:
This letter provides additional information regarding the
. testing of filters and ducts in the Byron /Braidwood HVAC filter systems. This information' is supplied at the request of the NRC Staff to address the' questions regarding FSAR commitments.
Attachment A.to this letter contains responses to Staff questions on filter and duct testing with respect to Regulatory Guide
.l.152 and 1.140. . Attachment B contains the handouts from a meeting with the NRC in Bethesda on June (5,1984. Attachment C contains revised FSAR pages which reflect %greements reached with NRC Staff regarding these matters. '
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Please. address further questions regarding this matter to
-this office.
Very truly yours, T 0.[W T. R. Tramm Nuclear Licensing Administrator 1m A
Attachments 8410230044 841018 PDR ADOCK 05000 9349N M i i c _ = - _
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ATTACHMENT A-
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14.: .Responsetto'NRC's Questi hs on Filter"and Duct' Leak. Testing
-Question l'.
~Audibleileaks must;be. sealed.
Response
Prio~r toSfinal. system turnover,Lthe n'on-accessible exhaust syst~em ofithe auxiliary building HVAC. system , the control room s
. recirculation system, and.the Fuel Handling fullding exhaust l system will be operated and the ductwork will be visually-and
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. s audibly checked for-leaks. Leaks will be sealed.
Questio'n: 2:
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. Ensure / laboratory analysis on charcoal be performed when
. painting,Lfire;or; chemical: release occurs.
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' Response
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1This will?beLen'suredeper commitment in the Technical .
1 , Specification. Signstwill be posted in the auxiliary building
' warning workers 1thatJthe' charcoal dampers should be closed to 7 avoid charcoal damage when painting, generating smoke, or.
- releasing chemicals.-
.B.. IResponse to NRC's Questions:on Filter and Duct Leak Testing ;
-(Regulatory-Gs de 1.140)
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-Question 1.
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-Radwaste. Building: Does-the contaminated interspace.have an MCP concentration less than-1.1 times'the MPC concentration'within
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the-duct?
- Response 2 3
The interspace concentration is equal-to or less than the Yes.
concentration:in the ductwork.
l Question 2 Does:the volume reduction filter unit-of Table.3 refer to that
': filtering potentially contaminated-cubicle of the VR. System or
- theLVR off-gas filter' unit? Both should be addressed in this
- table. 'The positive. pressure portion of this-duct does not-g;7 ' qualify to; exception "a" of Section 5.10.8.1 of ANSI N509-1980.
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Response
The. filter referenced-in the table (provided in'the written responses to NRC questions dated April 123, 1984, that.was given to J4r. J. Hayes' of ~ the'.ETSB in a meeting on June '5, 1984, in BethesdaU is the unit that' filters air from contaminated cubicles of'the VR System. . The' positive pressure duct associated with thisifilter will be leak tested. The VR Off-gas Filter Unit is s' deep bed charcoal unit that filters the process exhaust from
.the volumeireduction' system.
Only ventilation system' filters are addressed in the . table and the VR Of f-gas Filter- was not included.. The VR System design utilizes piping with welded connection and no ductwork is used.
Question 3
. Normal. Purge - What is the MPC of the duct? Is it less than 5 MPC?
, Response Yes,-the-duct is less than 5 MPC.
Question 4' t
Post-LOCA Purge - Rational for exclusion is unacceptable.
- Response Post-LOCA Purge duct that is under positive pressure will be
' le'ak : tested.
' Question 5 Mini-flow Purge - Is this the item on the bottom.of the table?
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Response
No. This is included in the discussion of normal purge ducts.
Question 6 TSC Supply - Istthe.TSC negative pressure duct going to be leak tested as indicated in the table?
Response
Yes'. _ The negative pressure duct sections that would affect the habitability of the TSC will be leak tested.
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ATTACHMENT B Slides and Handouts from Meeting June 5, 1984 Bethesda, Maryland 9349N
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6.5.1 ENGINEERED SAFETY. FEATURE AIR FILTRATION SYSTEM NRC COMMENT #1-(REGULATORY GUIDE 1.52, POSITION 2.F)
... REGULATORY POSITION 2 F 0F REGULATORY GUIDE 1.52 DOES
-NOT ADDRESS IN-PLACE TESTING NOR ANYTHING CLOSELY RELATED TO IN-PLACE TESTING,"; "...THE STAFF WILL REQUIRE THAT IN-PLACE TESTING BE PERFORMED IN ACCORDANCE WITH REGULATORY GUIDE 1.52."
CEC 0 RESPONSE WE CONCUR WITH THIS COMMENT.- THE INTENT OF OUR EXCEPTI0d TO REGULATORY POSITION 2.F WAS MEANT TO ADDRESS LIMITATI0ilS ON MAXIMUM CAPACITY AND OUR EXCEPTION HAS BEEd REVISED TO CLARIFY THIS. TESTING EXCEPTIONS HAVE BEEN DELETED FROM THIS EXCEPTION AND ARE NOTED IN EXCEPTIONS TO THE APPROPRIATE REGULATORY POSITIONS AS FOLLOWS:
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PROPOSED FSAR REVISION 2.F THE AUXILIARY BUILDING NON-ACCESSIBLE AREA EXHAUST FILTER SYSTEM CONSISTS OF THREE BUILT-UP FILTER TRAINS (ONE STANDBY) WITH A CAPACITY OF.66,900 CFM EACH. FOR
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MAINTENANCE FURPOSES EACH TRAIN IS DIVIDED INTO THREE BANKS WITH EACH BANK SIZED FOR SEVEN FILTERS WIDE AND THREE HIGH, THE AUXILIARY BUILDING ACCESSIBLE AREA EXilAUST FILTER SYSTEM HAS'A CAPACITY OF 162,300 CFM. THIS SYSTEM CONSISTS OF FOUR BUILT-UP FILTER TRAINS (ONE STANDBY)
AND EACH TRAIN IS DIVIDED INTO THREE BANKS. EACH BANK IS SIZED FOR SEVEN FILTERS WIDE AND THREE FILTERS HIGH.
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NRC COMMENT #2 (REGULATORY GUIDE 1.52, POSITION 2.L)
"...II IS IMPORTANT THAT THE FILTER HOUSINGS BE LEAKTIGHT.
HOWEVER, THIS TEST NEED NOT BE PERFORMED IF THE APPLICANT PERFORMS A MOUNTING-FRAME-PRESSURE LEAK TEST. A MOUNTING FRAME LEAK TEST VERIFIES THAT THERE ARE NO LEAKS THROUGH THE HEPA
. FILTER ..."; "THEREFORE, THE STAFF WILL REQUIRE THAT A MOUNTING-FRAME-PRESSURE LEAK TEST BE PERFORMED IN LIEU OF A FILTER HOUSING TEST."
CEC 0 RESPONSE WE CONCUR WITH THIS COMMENT. EXCEPTION TO REGULATORY POSITION 2.L HAS BEEN REVISED AS FOLLOWS:
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! PROPOSED-FSARjREVISION . _ _ _ , _ , _ _ , _
m 2.L;: FILTER H0'USINGS
.~ALL OF THE'AUXILIARYJBUILDING AND: FUEL HANDLING BUILDING EXHAUST 1 SYSTEM FILTER HOUSINGS ARE DESIGNED IN ACCORDANCE
, ,, WITH-ANSI N509-76. THE HOUSINGS'ARE-AT NEGATIVE PRESSURE
.WITH RESPECT TOLTHEIR SURROUNDINGS AND ARE LOCATED IN THE
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LAUXILIARY BUILDING GENERAL AREA, WHICH IS A LOW AIRBORNE RADIATION ENVIRONMENT.. ANY IN-LEAKAGE FROM THE GENERAL AREA
-WILL: NOT ADVERSELY AFFECT APPENDIX I RELEASES. HENCE, THE .
- HOUSINGS WILL.NOT BE. LEAK TESTED TO THE ANSI N509-76
- REQUIREMENTS. HOWEVER, FILTER MOUNTING FRAME LEAK TESTS WILL f BELPERFORMED IN'ACCORDANCE-WITH ANSI N510-80, i-
!: THE CONTROL ROOM EMERGENCY'MAKE-UP AIR SYSTEM FILTER HOUSINGS J
-ARE DESIGNED IN ACCORDANCE WITH ANSI N509-76. THE FILTER HOUSINGS ARE'AT NEGATIVE' PRESSURE WITH RESPECT TO THEIR SURROUNDINGS AND ARE LOCATED WITHIN THE CONTROL ROOM B0UNDARY, I :WHICH'IS A' HABITABLE ENVIRONMENT'THE SAME AS THE CONTROL ROOM.
ANYjlN-LEAKAGE 'WILL-BE FROM THE CONTROL ROOM ENVIRONMENT AND,
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-THEREFORE, WILL NOT ADVERSELY AFFECT THE QUALITY OF THAT EiiVIRONMENT: .HENCE, THE HOUSINGS WILL NOT BE LEAK TESTED TO ANSI N509-76 REQUIREMENTS. HOWEVER, FILTER MOUNTING FRAME F ~ LEAK: TESTS WILL BE PERFORMED IN ACCORDANCE WITH ANSI N510-80.
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-NRC COMMENT #3 (REGULATORY GUIDE 1.52, POSITION GJ
...THE-APPLICANT HAS INDICATED THAT THE DUCTWORK WILL NOT BE LEAK TESTED IN ACCORDANCE WITH ANSI H509-76 AND HAS NOT PROPOSED ANY l ALTERNATIVE-TESTING FOR THE DUCTWORK; EVEN THE LESS RIGOROUS
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TESTING OF ANSI /ASME N509-80. THE STAFF INITIALLY ACCEPTED THE
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-APPLICANT'S EXCEPTION-T0 LEAK TESTING THE DUCTWORK BECAUSE ALL RADI0 ACTIVITY WOULD LEAK INTO THE DUCTWORK AND WOULD BE FILTERED.
HOWEVER, FURTHER CONSIDERATION OF THIS EXCEPTION HAS RAISED OTHER QUESTIONS..,"
3.1 "0BVIOUSLY, THE ADDITIONAL IN-LEAKAGE TO THE DUCTS WILL RESULT IN AN INCREASE IN THE QUANTITY OF RADI0 ACTIVITY RELEASED OFFSITE IN THE EVENT OF AN. ACCIDENT."
3.2 "HOWEVER, MORE IMPORTANTLY, A GREATER PROBLEM EXISTS WITH RESPECT TO THE POTENTIAL DEGRADATION OF.THE CHARC0AL IN THE ESF FILTER TRAINS DUE TO THE UNKNOWN TRANSMISSION OF FUMES FROM PAINTING, FIRES OR CHEMICAL RELEASES VIA THE LEAKY DUCTWORK. SUCH A TRANSMISSION COULD BE CHRONIC AND PLANT PERSONNEL MAY NEVER LABORATORY-TEST THE CHARC0AL UNTIL THE SCHEDULED REFUELING OUTAGE.- IN THE INTERVENING MONTHS, THE PLANT MAY HAVE BEEN GPERATING WITH CHARC0AL INCAPABLE OF PERFORMING AT THE EFFICIENCY ASSUMED IN THE STAFF'S SER.
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NRC COMMENTL#3 (CONT'D) 13.3 "L...THE STAFF-IS ALSO CONCERNED THAT THE RELATIVE HUMIDITY-SEEii BY THE CHARC0AL ADSORBERS MAY BE ALTERED DUE TO THE VARIATION IN THE FLOW RATE BROUGHT ABOUT BY THIS DUCTWORK IN-LEAKAGE FROM THE VARIOUS SOURCES TO THE FILTRATION UNITS AND THAT THE .
TANALYSES PRESENTED BY THE APPLICANT JUSTIFYING THE EXCLUSION LOF. ELECTRICAL HEATERS MAY-BE IliVALIDATED."
-"THEREFORE, IT IS THE STAFF'S POSITION THAT THE DUCTWORK ASSOCIATED
.WITH THE: ESF FILTER SYSTEMS.MUST BE PRESSURIZED AND 'ALL AUDIBLE LEAKS MUST.BE LOCATED AND SEALED.- FURTHERMORE, IN ACCORDANCE WITH
' AilSI/ASME N509-80, ALL DUCTS MUST:BE SUBJECTED TO A QUANTITATIVE MEASUREMENT OF LEAKAGE UiiLESS THE DUCT IS LOCATED WITHIN A
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- CONTAMINATED ~ SPACE OR PROTECTED SPACE (AS-DEFINED lii AilSI/ASME N509-80) OR HAS.A LENGTH OF THIRTY FEET OR LESS MEASURED EITHER
_ FROM THE FAN OR THE- AIR CLEANING UNIT TO ITS TERMINUS. THE ALLOW--
ABLE LEAK RATES FOR THE DUCTS SHOULD BE IN CONFORMANCE WITH
- SECTION 4.12 OF ANSI-N509-80."
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CECO RESPONSE:
AUXILIARY BUILDING HVAC SYSTEM
-DUCT-LEAKAGE EFFECTS
- SYSTEM FUNCTION AND LAYOUT
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FIGURE 1 IS A SIMPLIFIED SCHEMATIC WHICH SHOWS 011E-HALF 0F THE
- AUXILIARY BUILDIiiG SYSTEM,WHICH IS SHARED BETWEEN UNIT 1 AND UiilT 2.
THE AUXILIARY BUILDING HAVC SYSTEM SERVES MULTIPLE FUNCTIONS. IT OPERATES DURING NORMAL PLANT OPERATION TO PROVIDE CONDITI0i1ED AIRi
- TO THE GEi1ERAL AREAS FOR COOLING PURPOSES. THE AIR SUPPLIED TO THE GEiiERAL AREA IS THEN Il1DUCED IliTO CUBICLES WHICH HAVE BEEN CATEGORIZED AS " ACCESSIBLE" AND "i10il-ACCESSIBLE." THE "NON-ACCESSIBLE" CUBICLES, SHOWN 011 THE ATTACHED, ARE S0 CATEGORIZED DUE TO THEIR POTENTIAL FOR BECOMING CONTAMINATED DURING EITHER NORMAL OPERATI0ii OR POST-ACCIDENT. AS YOU Call SEE Iii THIS LISTING OF NON-
~ ACCESSIBLE CUBICLES, SEVERAL CUBICLES OTHER THAN THE ESF PUMP CUBICLES ARE C TEGORIZED AS "NON-ACCESSIBLE." ALSO, "NON-ACCESSIBLE" CUBICLES OR AREAS ARE FOUilD Oil EVERY ELEVATI0i10F THE AUXILIARY BUILDING.
THE AIR'IS INDUCED INTO THE CUBICLES BY THE AUXILIARY BUILDING EXHAUST SYSTEM, WHICH DRAWS AIR FROM EACH CUBICLE,-THROUGH PREFILTERS AND HEPA'S AilD DISCHARGES THAT AIR TO THE OUTDOORS THROUGH THE .
PLAi1T VENTILATION STACK.
THE AIR DRAWii FROM THE "iiON-ACCESSIBLE" CUBICLES IS MONITORED BY RADIATION MONITORS LOCATED IN THE DUCTS, UPSTREAM 0F THE FILTER UNITS, 'AS WELL AS IN THE PLANT VENT STACKS, Oil A HIGH RADIATION SIGliAL, THE CONTROL ROOM OPERATOR Call DIRECT THE "NON-ACCESSIBLE" AREA EXHAUST THROUGH CHARC0AL AND HEPA FILTERS. NORMALLY, 7
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- HOWEVER, THESE-FILTERS ARE BYPASSED AND NO EXHAUST AIR FLOWS THROUGH THESE FILTERS. __ _ _ . _.
THE EXHAUST DUCTS FROM THE " ACCESSIBLE" AREAS IS ROUTED FROM THESE AREAS THROUGH THE GENERAL AREA TO THE PRE /HEPA FILTERS. ACCESSIBLE AREA EXHAUST DUCTWORK, EXCEPT FOR ABOUT A 5 FOOT SECTION OF DUCT, IS ROI ROUTED THROUGH N0li-ACCESSIBLE AREAS.
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ALL DUCTWORK ON THE SUCTION SIDE OF THE EXHAUST FANS, WHICH IS THE MAJORITY OF DUCTWORK, IS UNDER A iiEGATIVE PRESSURE. THERE IS NO
-DUCTWORK BETWEEN THE PRE /HEPA FILTER PLENUMS AND THE MAIN EXHAUST FANS-AND ONLY A SHORT DUCT (LESS THAN 30 FEET) BETWEEN THE CHARC0AL FILTER B00 STER FANS AND THE MAIN EXHAUST FAN. THIS
__ DUCTWORK IS WITHIN A HOUSING.
THE QUANTITY OF AIR SUPPLIED TO THE GENERAL AREAS AND TO THE :
CUBICLES IS BASED ON MAINTAINING DESIGN TEMPERATURES DURING NORMAL PLANT OPERATION WITH A LOWER LIMIT TO MAINTAIN DIRECTION OF FLOW INTO THOSE POTENTIALLY CONTAMINATED AREAS WITH LOW HEAT GAIN DURING NORMAL OPERATION. ON THIS MODE THE SYSTEM FUNCTIONS AS A NON-ESF COOLING SYSTEM WITH NON-ESF FILTRATI0ii (REGULATORY GUIDE 1.1410).
POST-ACCIDENT, THE SYSTEM ASSUMES ADDITIONAL FUNCTIONS. COOLING THE ESF PUMPS LOCATED.IN CUBICLES IS PROVIDED BY COOLERS LOCATED WITHIN THE PUMP ROOM WHICH RECIRCULATE AND COOL THE CUBICLE AIR.
AIR CONTINUES TO BE EXHAUSTED FROM THE "NON-ACCESSIBLE" AREAS AND ON SI OR HIGH RAD SIGNAL IS DIRECTED THROUGH THE CHARC0AL FILTERS.
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IF NO COINCIDENT L0EP OCCURS, THE REMAINING COMPONENTS OF THE AUXILIARY BUILDING SYSTEM OPERATE AS IN NORMAL PLANT OPERATION.
IF A COINCIDENT L0EP OCCURS, UNTIL DlESEL LOADS ARE SHED (APPR0XIMATELY 2 HOURS), ONLY 2 CHARC0AL B00 STER FANS OPERATE
.T0 MAINTAIN THE BUILDING AT A NEGATIVE PRESSURE AND FILTER AIR
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FROM THE ESF PUMP CUBICLES AS WELL AS OTHER "NON-ACCESSIBLE AREAS" (THE LATTER NOT REQUIRED, BUT IS DONE BASED ON DESIGN FOR
. NORMAL PLANT OPERATION). THUS, POST ACCIDENT, THE AUXILIARY BUILDING HVAC SYSTEM OPERATES PRIMARILY AS AN ESF FILTRATION SYSTEM. DURING THIS LATTER MODE, THE CONTAf11NATED SPACE COULD BE CONSIDERED TO BE THE ENTIRE AUXILIARY BUILDING.
AS YOU CAN SEE THIS SYSTEM HAS MULTIPLE PERSONALITIES AND DOES NOT FIT NEATLY INTO THE CATEGORIES DEFINED BY ANSI N509 MAKli1G INTERPRETATIONS VERY DIFFICULT. 'IT IS IMPORTANT TO KEEP A CLEAR UNDERSTANDING 0F THE SYSTEM'S FUNCTION DURING ANY DISCUSSION OF SCENARIOS.
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DUCT CONSTRUCTION THE COIISTRUCTION DETAILS OF THE DUCTWORK USED FOR THE AUXILIARY BUILDING HVAC SYSTEM NEETS.0R EXCEEDS THAT USED THROUGHOUT THE SHEET METAL INDUSTRY AS RECOMMENDED BY SMACHA, SHEET METAL AND AIR CONDITIONING CONTRACTORS NATIONAL' ASSOCIATION. IN MOST
.. CASES, THE DUCTWORK IS ONE GAUGE HEAVIER THAN THAT RECOMMENDED BYSMACNA. THE TRANSVERSE JOINTS AND LONGITUDINAL SEAMS ARE IN ACCORDANCE WITH SMACNA RECOMMENDATIONS.
THE TRANSVERSE JOINTS ARE ALL GASKETED, BOLTED COMPANION ANGLE TYPE (SEE FIGURE 2) WITH COMPAsil0N ANGLE JOINT CORNERS SEALED TO LIMIT LEAKAGE. O THELONGITUDINALSEAMSFORDUCTSLESSTHANkB"INEITHERWIDTHOR HEIGHT ARE MECHANICAL LOCK SEAMS (PITTSBURGH LOCK) WHICH IS A MULTIPLE LAYER, INTERLOCKING JOINT. FOR DUCTS 48' AND LARGER, THE L0dGITUDIi1AL SEAMS ARE WELDED. .
THERE IS A LOT OF SHEET METAL li1DUSTRY EXPERIENCE WITH THIS TYPE OF CONSTRUCTION AND THE EXPERIENCE HAS SHOWN THAT LEAKAGE LESS THAN 1% OF SYSTEM CAPACITY IS POSSIBLE. SMACHA, IN THE HIGH PRESSURE DUCT CONSTRUCTION STANDARDS, STATES:
"HIGH VELOCITY DUCTS MUST BE SUFFICIENTLY AIR TIGHT TO INSURE ECONOMICAL AND QUIET PERFORMANCE OF THE SYSTEM. IT MUST BE RECOGNIZED THAT AIR TIGHTi1ESS IN DUCTS AS PRACTICAL MATTER CANNOT, AND NEED NOT, BE ABSOLUTE (AS IT MUST BE IN WATER PIPING SYSTEM). ADEQUATE AIR TIGHTNESS CAN HORMALLY BE ASSURED BY: A) SELECTION OF C0i1STRUCTION 10
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DETAIL KNOWN TO COMPLY WITH THE FUNCTIONAL STANDARDS fiUMBER3ANDNUMBER4INCHAPTER11;B)-PROPERASSEMBLY AND C) ELIMINATION OF LEAKS THAT ARE AUDIBLE AND THOSE
{THATiCAll BE FELT BY HAND.
i WHEN AIR AT A PRESSURE OF 4" W.G. OR GREATER ESCAPES -
- THROUGH A SMALL-0RIFICE, IT WILL CAUSE NOISE. AS GREATER AMOUNTS OF AIR ESCAPE FROM THE:0RIFICE, THE 110lSE LEVEL WILL Il1 CREASE. CORRELATION OF. EXPERIEiiCE -lil ELIMIi1ATING
-ALL AUDIBLE: LEAKS AND ACTUAL MEASUREMENT OF-LEAKAGE HAS LED TO THE CONCLUSION THAT BY ELIMINATING-ALL LEAKS WHICH ARE AUDIBLE TO THE AVERAGE PERSON IN REASONABLY QUIET SURROUliDINGS, THE TOTAL LEAKAGE WILL BE LESS THEN (1)
PERCENT OF THE SYSTEM CAPACITY.-
FURTHERMORE,-LEAKAGE TESTS ARE-AN ADDED EXPENSE IN SYSTEM INSTALLATI0il. THE DESIGi1ER SHOULD DETERMIiiE THE ACTUAL NEED FOR LEAKAGE TESTS, IN SOME CASES REPRESENTATIVE TESTS (0F SELECTED PORTIONS OF A SYSTEfD MAY BE DESIRED; LIN 0THERS-THE~ COMPLETE SYSTEM MAY BE TESTED. WHEN PROJECT
. REQUIREMENTS ARE SUCH THAT THE THREE ELEMENTS OF LEAKAGE-CONTROL-MENT 10fiED AB0VE WILL NOT SERVE TO INSURE SATISFACTORY INSTALLATION, THE PROJECT DOCUMENTS SHOULD CLEARLY INDICATE THE EXTENT 0F TESTING REQUIRED. TEST-
' PROCEDURES ARE DESCRIBER HEREINAFTER."
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. '00R EXPERIENCE;WITH DUCT LEAKAGE TESTING HAS SHOWil THAT WITH THIS LTYPE-0F C0ilSTRUCTION LEAKAGE-0F 0.05 CFM/FT2 IS POSSIBLE. (THIS \,
! -ISJLESS THAN HALF THE ALLOWABLE LEAKAGE RATE FOR ESF CLASS II ,
DUCTS IN N509.F FOR EXAMPLE,150 FEET OF 44 x 20 LABORATORY ,
EXHAUST: SYSTEM DUCTWORK' FABRICATED TO THIS TYPE OF CONSTRUCTION ,
WAS TESTED AT' BYRON AND FOUND TO EXHIBIT .03 CFM/FT2 0F LEAKAGE. '[
- IETEUS PUT THIS QUANTITY IN PERSPECTIVE FOR THIS TYPE OF SYSTEM. /
- WITH A TOTAL. SYSTEM CAPACITY OF'AROUND 350,000 CFM, THE LEAKAGE /
RATE .IS AS -S0WN 'IH TABLE 2.
- THE MOST: STRINGENT REQUIREMENT'IS 1% OF SYSTEM CAPACITY. REMEMBER
'THAT'00R SYSTEM HAS MULTIPLE PERSONALITIES. WHAT IS THE E LAPPROPRIATE SYSTEM CAPACITY FOR AIR CLEANING EFFECTIVENESS? AND WHY IS 1% LEAKAGE THE-SACRED i1 UMBER? IN THIS CASE, THE CAPACITY 4
IS SET PRIMARILY.BY NORMAL COOLING REQUIREMENTS AND NOT BY FILTRATION REQUIREMENTS. THUS, THE ALLOWABLE LEAKAGE--RATE COULD
.BE'MUCH HIGHER.- HEALTH PHYSICS,-IN TERMS OF AFFECTING 0FFSITE
-D0.SE, SHOULD.BE THE LIMITING FACTOR. FOR THIS CASE, THE IMPACT OF: DUCT' LEAKAGE IS NEGLIBLE ON OFFSITE' DOSE, POST-ACCIDENT, SINCE ALL THE LEAKAGE IS INTO THE DUCTWORK UPSTREAM 0F THE FILTERS.
[ DURING NORMAL > OPERATION, INLEAKAGE WILL ALSO BE FILTERED IF AIRBORNE PARTICULATE OR GASEOUS IODINE LEVELS EXCEED MONITORING L : LIMITS EXPECIALLY SINCE ACCESSIBLE AREA DUCTWORK'IS NOT ROUTED
. THROUGH NON-ACCESSIBLELAREAS.
IN ADDITION, AS I POINTED OUT BEFORE, THE AUXILIARY BUILDING COULD i
- BE CLAS,SIFIED AS-A CONTAIMINATED SPACE POST-ACCIDENT (SINCE OUTSIDE
-AIR'IS BEING DRAWN INTO THE BUILDING AND COULD CONTAIN HIGH CONCENTRATIONS 0F PARTICULATE N0BLE GASES, IODINE AND, THEREFORE, 12-
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AS-YOU P0liiTED OUT IN YOUR COMMENT, WOULD NOT BE REQUIRED TO BE LEAK TESTED. -
FOR THESE REASONS WE DO NOT FEEL A COMPLEX, COSTLY, LEAKAGE TEST IS REQUIRED.
TO FURTHER SUPPORT THIS, WE WOULD LIKE TO POINT OUT THAT ALL AUXILIARY BUILDING HVAC SYSTEM DUCTWORK IS INSTALLED IN ACCORDANCE WITH HVAC CONTRACTOR'S QC PROCEDURES AND IS THOROUGHLY INSPECTED
'AFTER IliSTALLATION. A SAMPLE CHECKLIST IS ATTACHED.
FROM THIS CHECKLIST YOU CAN SEE THAT THE INSTALLATI0ii IS INSPECTED TO ENSURE PROPER CONNECTIONS AND WILL HELP TO MINIMIZE GROSS LEAKAGE DUE TO INCOMPLETE INSTALLATION G11SSING ACCESS DOORS)
WHICH IS THE MOST PROBABLE CAUSE OF HIGH LEAKAGE.
IN ADDITI0li TO THE DETAILED INSPECTION, THE HVAC SYSTEM IS TESTED
.AND BALANCED, ACTUAL SYSTEM AND BRANCH AIRFLOWS ARE MEASURED USING PIT 0T iUBES AND FLOWS ARE BALAi1CED TO ACHIEVE DESIGN FLOW RATES. DURING THIS PROCESS, GROSS LEAKAGE WOULD BE DETECTED IF DESIGil FLOW RATES COULD NOT BE ACHIEVED.WITHIN MEASUREMENT
- TOLERANCES. IT IS A'LSO POSSIBLE TO COMPARE MAIN SYSTEM FLOW RATES WITH THE SUM 0F THE FLOWS FROM EACH BRANCH AND THUS IDENTIFY AjiY MAJOR FLOW DISCREPANCIES.
THESE MEASURES, WE FEEL, WILL ENSURE THAT GROSS LEAKAGE WOULD BE DETECTED add NECESSARY CORRECTIVE ACTION TAKEN. ANY REMAINING LEAKAGE WOULD NOT BE SIGNIFICANT OR DETRIMENTAL TO THE BASIC SYSTEM FUNCTION. WITH THIS IN MIND, THE FOLLOWING ARE THE SPECIFIC RESPONSES TO THE THREE ISSUES IDENTIFIED:
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f j c3;1~ : EFFECTS ON-0FFSITE;RADIACTIVITY RELEASES
- BECAUSEIOFTHELDUCTROUTING,DIRECTIONOFAIRFLOWFROMCLEAN TOLDIRTY AND SYSTEM OPERATION LEAKAGE INTO THE ACCESSIBLE OR
- NON-ACCESSIBLLAREAEXHAUSTDUCTWOR1(INTHEGENERALACCESS
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AREAS WILL.BE CLEAN AND, IN RELATION TO OVERALL FLOW RATES, -
SHOULD BE A RELATIVELY'SMALL QUANTITY. THE ACCESSIBLE AREA DUCTWORK IS ROUTED.THROUGH THE CLEAN AREAS WITH THE EXCEPTION OF
'AL5 FOOT SECTION OF DUCT. THERE WOULD'NOT BE ANY POTENTIALLY
' CONTAMINATED AIRELEAKAGE INTO THE ACCESSIBLE AREA DUCT WHICH WOULD BYPASS THE CHARC0AL FILTERS. INLEAKAGE INTO THE NON-
- ACCESSIBLE AREA DUCTWORK ALONG WITH THE EXHAUST FROM OTHER NON-ACCESSIBLE CUBICLES WILL BE MONITORED BY RAD MONITORS LOCATED IN BRANCH DUCTS AT THE INLET TO THE FILTER PLENUMS.
THIS EXHAUST AIR WILL THEN BE' DIRECTED TO CHARC0AL FILTERS IF
.LEVELSLXCEED.MONITORSETPOINTS. IN ADDITION, PLANT VENT STACK RAD MONITORS MEASURE AND: RECORD PARTICULATE, NOBLE GAS AND
'IODINELCONCENTRATIONS AND ALARM CONDITIONS WHICH EXCEED MONITOR
'SETPOINTS. ' TOTAL VENT STACK AIRFLOW RATES ARE RECORDED.
~ 3. 2 EFFECT ON CHARC0AL EFFICIENCY
- WITH RESPECT TO: DEGRADATION OF CARBON EFFICIENCY DUE TO UNKNOWN TRANSMISSION OF FUMES, THE CHARC0AL FILTERS WILL NOT BE IN THE AIP..? LOW PATH UNLESS:THERE-IS A HIGH RADIATION PRESENT-IN THE NON-ACCESSIBLE AREA EXHAUST-IN EXCESS OF MONITOR SETPOINTS.
'IF THE-CHARC0AL FILTERS ARE ON LINE, LEAKAGE INTO THE DUCTWORK WILL NOT RESULT IN ANY SIGNIFICAi1T INCREASE IN DEPOSITION OF lli -
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3.2 EFFECT ON CHARC0AL EFFICIENCY (CONT'D)
CHEMICAL FUMES ON THE FILTERS.~ IF A RELEASE DID OCCUR IN THE GENERAL AREA 0F THE AUXILIARY BUILDING DUE TO THE GENERAL LAYOUT OF THE BUILDING, THE PRINCIPLE AIR MOVEMENT PATTERN IN THE BUILDING (I.E., DIRECTION OF AIRFLOW FROM GENERAL AREAS TO CUBICLES), THE OPEN HATCHES AND STAIRWELLS THROUGHOUT THE
, BUILDING AND EXISTENCE 0F NATURAL THERMAL DUCTS THROUGH THE GENERALAREA,THEFUMESCOULDENDUPONTHEFILTERSEVENIF THERE WERE NO INLEAKAGE. IT CANNOT BE PREVENTED. THEREFORE, IT HAS TO BE ASSUMED THAT A RELEASE IN ANY AREA, OTHER THAN l INSIDE AN ACCESSIBLE CUBICLE, COULD END UP IN THE CHARC0AL FILTERS IF IT IS NOT REMOVED BY OTHER MEANS (I.E., PLATE OUT OR OTHER ABSORPTION MECHANISM).
3,3 EFFECT.0N RELATIVE HUMIDITY SINCE GROSS LEAKAGE WILL BE DETECTED THROUGH THE DUCT INSPECTION AND TESTING AND BALANCING, THE REMAINING LEAKAGE FOR THIS TYPE OF DUCT CONSTRUCTION WILL RESULT IN VERY INSIGNIFICANT LEAKAGE COMPARED TO THE TOTAL SYSTEM FLOW RATE.
'IF WE VERY CONSERVATIVELY ASSUME 10% LEAKAGE INTO THE EXHAUST DUCTS IN THE GENERAL AREA, ADJUST THE FLOW RATES ASSUMED IN THE MOISTURE CONTENT CALCULATIONS ACCORDINGLY, AND FURTHER CONSERVATIVELY ASSUME THAT THE INLEAKAGE AIR IS AT 100% RH, THE
. RELATIVE HUMIDITY WOULD BE INCREASED FROM 51% TO APPROXIMATELY 59%. IN FACT, LEAKAGE RATES OF UP TO 30% OF THE AIRFLOW RATE COULD BE TOLERATED AND STILL NOT RAISE THE EXHAUST AIR RELATIVE HUMIDITY AB0VE 70%.
15
- 3. EFFECT Oii. RELATIVE HUMIDITY (CONT'D)
FIGURE 3 SHOWS WHAT INSIGNIFICANT EFFECT LEAKAGE HAS ON THE RELATIVE HUMIDITY OF THE AIR STREAM ENTERING THE FILTER PLENUM EVEN WITH THESE CONSERVATIVE ASSUMPTIONS.
-IN CONCLUSION, THE REQUIREMENT FOR DUCT LEAKAGE TESTING FOR THE AUXILIARY BUILDING DUCTWORK IS uni 1ECESSARY AND EXCESSIVE BAS SYSTEM FUNCTION, LAYOUT, CONSTRUCTION AND PRESENT INSPECTI0li AND TESTING PROCEDURES. THE MAGNITUDE OF POTENTIAL LEAKAGE HAS RELATIVELY LITTLE OR NO IMPACT Od 0FFSITE DOSE, CARB0ii EFFICIEliCY DEGRADATION OR EFFLUEilT RELATIVE HUMIDITY.
PROPOSED FSAR MViSf005_
NONE 9
\
16
i_ - ,
TABLE 1 -
' Room Descripti'on "
Floor Elevat: ion Filter. Valve Aisic~
- * -- -
- 383'
- 383' .
Filter Rooms . ,
Filter Pipe Tunnels . 383'
- Pipe Tunnel:- Units 1 and 2
~
394'-6" Residual !! cat Remover Mixed Room -
~
357' .
lA, in, 2A and 2B . ,
.Pipo Penetration Area - Units 1 and 2 364'
- Pipe Tunnel - Units 1 and 2 375' -
Safety Injection Pump - 1A, 1B, 2A and 2B 364' Positive Displacement Charging Pump Room - 364.'
Units 1 and 2 Centrifugal Charging Pump Room - ,
364' 1A, 1B, 2A and 2B
-Recycle I!old up, Tank Pipo Tunnel 374'-6" Residual IIcat Remover Pump Room - 343' 1A, 1B, 2A.and 2B ,
, Containment Spray Pump Room - 1A, 1D, 2A and 2B 343' Recycle Evaporator Feed Pump - OA and OB 346' Recycle Evaporator Room - OA'and OB 344'-6" Gas Decay Tank Valve Aisle
. 346' Gas Decay Tank Room ,
'346'
- Gas Decay Tank and Recycle Evaporator 355'-4" &
Pipe Tunnel 358'-2"
'CollectionbrainSumpRoom-Units 1and2 346' -
Floor Drain' Sump Room - Units 1 and 2
~
330' Equipment Drain Pump Room - Units 1 and 2 330'
(
- 9 ,
e D
g 9
17 W-
TABLE 2- , .
~
AUXILARY BUILDING- '
HVAC-SYSTEM ESTIMATED ALLOWABLE IFAKAGE .
h TOTglFgGE RAIEk*)
AIR CLEANING EFFECTIVENESS 1.0% 3,500 (.06 CFM/FT2 )
-- DUCT AND HOUSING QUALITY .10.' ~ 6,000 l CFM/FT2 HEALTH PHYSICS -
N.A.
CLASS II DUCT, 350,000 CFM 60,000 FT2 l
t .
d-
c,
.l.,
.- _ 4. . To viiw r sT/e g FIGURE 1
, e----i - rap MotJITc>:. now.tentdM. AUXILIARYBUILDINGHVACSYST$F1 I%z+2CR.
gt' i
jl t t 1 4 4 cw m ii i .i' ' EX il A41 C T P<ourti K I
Mi'*
.' l. i .
. TON N E L. Y Y i
i .
i
- 4 ExHAusTr/4ts 477, o
! . s
' ' ! /L A '
- t. uc+4-S s,. tr.c
\
c) f u gyg,.y gems .O W
. cilAfst.
' Acc. re(. Pass
@ PAD Ft.EllLJH -
H N& FONI"..
!I '
k> M 4 61 nummunut
'i -->'
I f {
l,. l 110ftAGd
- i' a., cc t o v
-l [-l : .
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., . N -
, p -
! k> tlat ty 5 cc GL. 4 cal '. O
- i B>'
g /<.c .
EY .. :
- . 1i, .-
l' *
, tio n-uc, .
tL. '6t% '. 0 "
t .
t * '
N>
i .
Ax i i N,
c ,
,. I
- j ;i e it. 3 6 4 ,.o .
i>
v pou x c -
y n .j t
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- j. {', '..
g> ,
v
- g. ; x . .- . ..
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itorJg.c .
i s.li ~
- sk l $ ' r. Y
! .. y jig ,
> tt0N A:c.,
t t. M,o ,. O i: ,
\ \ ,
19
FIGURE 2 - ~-
? .
SEAL AROUND ROD FROM
- INSIDE OF DUCT
/
CELD ROD TO ANGLE p-e -
5
=
s 7 MIN.(DIA. SOLTS AT 4, MAX. FIRST INTERVALS GASKET OR MASTIC ". .
d* CIA. 80LTS AT TIE ' R OD y
4" MAX. INTERVALS TACK WELDS, RIVETS OR SCREWS
^
- I AT 12" MAX. INTERVALS to - '
f' l_ f FLANGE ON -
a ,
, , DUCT TYPICAL JOINT SECTION ' ^
GASKET r
s / l SEAL CORNER
/ I
)
3 I WELD ANGLES TOGETHER AT ["l CORNERS
[ [l *
(
/ ,
m '
.,I CORNER DETAll /
PITTSBURGH LOCK SEAM 18 ga and less I
^
~' .. .
%S -
{ FIGURE 3 FROM MOISTURE. CONTENT AN'ALYS'IS .. REP,0RTI ,, .,f
'., Flashed vapor
"-' '* 1 from 50 gpm leakago* -
EllR Pump I M g- ;.- I~'..'-- , , ,,
>- . cubicle . .
-
- 107 6 cfm *
..' A 90.6_F - : .
483J5% *!
y Auxiliary ).
- V ,.
Duilding
@V -
B tu
- El. 346'0" E .
304900 hr
- !27464 cfm * -
+
- 49,7 y .g[ .. .
A *
>y
'.62.2%
.i
) ,
Auxiliary ,
Building . '
M 26388 cfm* -
~
4 - -
. unheated
~_ '* ~
~. ~
9 O .hBtu *7 . stream 49.7 F . .
From blowerj -
'h 96000 cfm*
s
~
0.0 hr
.62.2%
I 6.0 F
- 1*
- 'y '
,i
. . ~.
90.0% *
{g}
- s ,
~, -
, _ ~
" * ' ~
. ;27464 cfm
- 4 . ,
51.8 F ,
~
- ' 145.2%, .otz 16.a/lbda. '
i .
y
. V
. 10% .lNLewMic -
D i .
h D > EBalance of'
~
V
[ h V
- > ; ToCharcoal hoo [o RQ.
c 4
en l
Auxiliary '
96000 cfm* 4 Bed Filter ., o,Olb.\bdlQ g 2420600 Btu * ' . Building ~ 68536...cfm * .~
g pr 70.8:P 65.3'F
.593Ri! . ,
c* o 2 9 . 3 % '~
5 i
p.m% tba/IbA ,o. ocivs- 10.9/ lbdq; ,
ra FIGURE 2: Case from . Table 1 with Highest Relative ilumidity- -
?
s .
FROM MOISTURE CONTENT ANALYSIS REPORT '
U
~ *These quantities are input data and all the remaining temperatures and .
relativo humidities were calculated as described in Section V.
i f . .
?
~
- 's
C g ,
~
ggyg. INEMlud LiitLALibi 4
- v g .',' N' -
. RELIABLE SilEET METAL WORKS s INC. ,
PROCEDURE AMENDM5NT AUTIIORIZATION (RSM FOP 24 31-1)
L
.3
- m. -
Page Article -
23- Rev.
' ~
- Date 9-24-82 Affected -
of - Affccted *
-h e o
,3 Revised Fort Page 1 of 2 : trrt 2 sYsmumsrsrts tsstrertes tztext (r.ss rons 23-6. in. t) vs. 1 SYSTEM FRELL111utt FIML S d,L LRAWING No. 3;tEET RW.
INSPECTION CC'/IW,E TaoM T3 v.. .
. 1. EEVIEW 0F TYPE 1 INS?ECTICI ECC:J'i.VIATICS aca. l se-. "=p r e A. Fab. Ticket s and 1.R.'s Complete '
S. N.R.'s closed (List Open) '
C. D.R.'s Closed (List 0;en) '
?* ,
O. ICi(a)/T01(s) used in as$ttion ~
to design drawings 9 I
- QCit - . LET L 8 M8
- 2. CUCT SIC 10N(3)
Ac.c. l o r * ) s tv o.<.s A. Installations are identified P _~ TI per ESM Proc. 33 Rev. t
- s
- 3. Installation per Design 7,r.g..
Details and Duct. Const. .'.neaal
' $ T
- E'
- C. Co=ponents Undsenged f- 'l'
- D. 331ttag Carplete
-E . Sealants Applied t F. Velds Falsted t C. D3 initiatei _ Yes _ No 5 8
- - DR No.
CE closed 3yt .
Dates qcg: LZ .h oms :
- 3. . AI A M031tC?.3/ AIR C.L't?!RS/ TIRE OL*.FgistrLEX CONSIO!!ON5/ACCES$ CC013?:1!L*.$. AA:*MI!'i (U!!5 l , 8 nwp e; n ee , .t. _.e.t. ,I A. Receipt inspection reports
+
- corpiece :
3..lasta114tions are ident1*1ed '
3 8
'g3
,i',
C.
Per ESM Free. 23 Rev.
Installation per Design Drws..
Detatts and Cutt. Const. .".anaal L_'J * *
, , 7 .
D.' Comoonents Unda.agod
'p .t -l E. Sotting C rplete
,\?
I r. Sealants Applied .
. C. Velds Fainted H. DE initiated _ Yes _ No ~
LR No. i DR Closed Sys Datet t-3: __
QC1 LEVEL: CSTJ:
- o;~
,.., t s..
e- e.. -
,f,L ,L. ..,..-.; ,/./ wp ,..t
..-),.s c
+
p, f Prspared by/Date
[ 6 7bU
~
&o s,
[_
.. Owner Station Construction b
Approved by/Date g7 A[ b N3
,3t ,y,p.M b 6 /7/f) Owner Quality {) sura:.de' Qtlality Assurance Sepervisor
- m. 22
- p. p .
SMPLE INSPECTI0it CHECKLIST .
e- g" -
9 s?-
. RELIABLE SilEET METAL k'ORKS, INC.
. PROCEDURE AMENDMENT AUTIIORIZATION (RSM FORM 31-1)
Prac: dure .
Page Article -
23 Rev. -
Date' 9-24-82 Affected Affected
- Typp/No.- -
o f __ _
O Rrvised Form Page 2 of 2 ST5 TEN /SU35YSTEM INSFECICN TI?cRT (R. M ftg3 23 6. RIV.1) pg. 2 SYSTEM .
S & L DRAVING No. SHEET LIV.
INSPECTTON COV! RACE T?cM TO INSPECTION TYPT Y . DESTON C9.A*.'INO ??'t. . .
. QC YM'!T* ".n** '!>!!
. 1. - INST >LLATICN IN PIACI. INTACT. L"JOA" ACED
, 2. NO IULD TACS ATTAC.ID
- 3. DI!C10?ANCY KITO?.!S C* CS!3
- 4. TESTING AND BALANCINC REFCRIS AF?RCVED COMMENTS:
- SYr CCI INT?!C M /ttvit AN.
INSPECTION T T & .
FINAL ACCEPTANCE CF IN3;ALLAT!cN Ft110t Ppccg:GI 2J R.!?. FMA .
- 4. ,. INSTAEf>T!CN ACCT!3 g rM s?!ms Pt?'.*'i /S8 T!
.; I. HAN2RS 2 DUCT
- 3. SUIf!NOID ICUIFE.r Y 4 5!T EQUI?MEST
- 3. No Fot.D TACS ATTACxED FINAL ACCEFTANCE OF DOCL?I.TIATICM PER COMPLETICN CF INSPECTICN TYPE 51. 2 AN3 3.
CA DOCMNTATION ACCEMED ___ CC I'ISFTCTCR/ LEVEL / CATI 1..RAN215
- 2. DUCT
- 3. suSPENcID ECUIPMENT
. 4 SET EQUIFENT
- 3. TIST AND BAIANCING REPCRTS ColetENTS:
C%
QC INSPECTCR/IIVtt SATE:
FROJECT SVPERI:frENCE:rf AF?ROVAL/CATEt CUSTCMER REPRESENTATIVE ACCEMANCE/0 ATE:
Pr:p; red by/Date . , ] s, ,yg,i. g L ' 1.*' j '
- s. .- -
~
msAA & 6l3le3 _ __ k,%GLW 6053
-' O*ndr Statica Construction
/Apprcve'd by/Date
,7 /WAAhAE b S3 E
, w :.O N M 4 / 7 [ f .3 Ownci Quality Aeprancc -
Quality Ascurance Supervicor .
23
..'. . SAMPLE lilSPECTION CliECKLIST .
g*.;: 1. ' - .
- T>YSTEM/SUESYSTEM FINAL-INSPECTION REPORT
- .- JOS NUMBER: C-761006 . CUSTOMER: COMMON"EALTH C ISCN DUC CO ' P I' MANUAL RF.V./DATE p: ,
INSPECTION TYPE 2 - REVIEW /ED ACCEPTANCE OF INSTALLATION QC INSPECTOR /'.E*iEL/DATE
- 11 Rev.
'. #12 Rev.
- 1.< INSTALLATIONS IDENTIFIED PER RSM PROCEDURES #15 Rev. ~
- 2. INSTALLATION PER DESIGN DRAWI2;G, DETAILS AND DUCT CONST. MAN.
. 3. - COMPONENTS U::DA:U.GED .
"4 . ALL REQUIRED BOLTING COMPLETE PER DUCT CONSTRUCTION MANUAL
- 5. ALL REQUIRED SEALANTS APPLIED PER DUCT CONSTRUCTION MM;UAL
- 6. ALL REQUIRED WELDS ARE PAINTED PER DUCT CONSTRUCTION MA';UAL
- 7. NO EOLD TAGS ATTACHED
-8. DISCREPM;CY REPORT INITIATED YES NO
.DR# ,
.- DR CLOSED: BY DATE 4' COMMENTS:
' BY:. OC INSPECTOR / LEVEL DATF.:
REVIEW AND ACCEPTANCE OF INSPECTION TYPE 1 DOCUME::TATION
_ QA
_ QC INS?ECTOR/*_EVEL/DATI
- 1. FAB. TICRETS AND INSPECTION REPORTS COMPLETE
- 2. - NONCONFORMM;CE REPORTS Fl?E?J.I:!CED AND CLOSEU
- 3. DISCREPANCY REPORTS CLOSED .
4 ECN(S)/FCR(S) INCORPORATED INTO DESIGN DRAWINGS C0leiENTS:
- ~ . ~ + * ~. t. .
" *h*Jl y s .w .A.a . .. .- ., .
. a..~L
=
l QA BY: ~ 'QC INSPECTOR _ LEVEL DATE
\.
i (RSM FORM 23-6)
I -
o l
24
NRC COMMENT #4 (REGULATORY GUIDE 1.52, POSITION 2 G)
"...IT IS NOT APPARENT TO THE STAFF HOW THE APPLICANT WILL BE ABLE TO ENSURE THAT THE FLOW RATE IN THE NON-ACCESSIBLE AREA EXHAUST FILTERSYSTEMSAND'THECONTROLR00iiEMERGEliCYMAKE-UPAIRFILTERS lS MAINTAINED WITHIN +10% OF ITS DESIGN FLOW WHEN FLOW IS ONLY SENSED, IT MUST BE ENSURED THAT THE RESIDENCE TIME IN-THE-- -
CHARC0AL ADSORBER IS MAINTAINED AT THE DESIGN VALUE OF 0.25 SECONDS PER TWO INCHES OF CHARC0AL AND THAT THE FLOW RATE CAPABILITY 0F THE HEPA FILTERS IS NOT EXCEEDED. THEREFORE, THE
. APPLICANT SHOULD ADDRESS HOW FLOW WILL BE MAINTAINED TO SATISFY THESE CONDITIONS..."; "...THE APPLICANT SHOULD ALSO ADDRESS THE
~
' REC 0RDING~0F FLOW FOR THE FUEL HANDLING BUILDING FILTRATION UNITS."
CEC 0 RESPONSE A. AUXILIARY BUILDING NON-ACCESSIBLE EXHAUST FILTERS AND FUEL HANDLING EXHAUST FILTERS EACH OF THE AXVILIARY BUILDING NON-ACCESSIBLE EXHAUST FILTERS
.AND FUEL HANDLING EXHAUST FILTERS ARE PROVIDED WITH THE FOLLOWING:
- 1. TWO 100% B00 STER FANS
' LOGGED BY SEQUENCE OF EVENTS RECORDER IN THE CONTROL ROOM.
- 4. FAN PRESSURE DIFFERENTIAL. INDICATION ON LOCAL CONTROL PANEL
- 5. FLOW INDICATION ON LOCAL CONTROL PANEL ,"
25
~.,
CECO RESPONSE (CONT'D)
FIGURES 11 AND 5 PROVIDE THE FAN NORMAL OPERATING POINTS BETWEEN THE CLEAN AND DIRTY FILTER RESISTANCE IN THE SYSTEM FOR NON-ACCESSIBLE FILTERS AND FUEL HANDLING BUILDING EXHAUST FILTERS, RESPECTIVELY. AS CAN BE SEEN FROM THESE CURVES, FOR. .
SYSTEM NORMAL OPERATING CONDITIONS, THE FLOW VARIATION
~
BETWEEN TWO POINTS IS LESS THAN 10%, THUS ASSURING DESIGN FLOW.
FOR ANY POSTULATED SYSTEM UPSET CONDITIONS, THE FAN WILL BE OPERATING BEYOND THE TWO OPERATING POINTS, WHICH WILL THEN BE
-ALARMED AT MCP BY EITHER THE HIGH OR LOW AP ALARM OF THE FAN THUS ALERTING THE OPERATOR FOR FURTHER ACTION.
ALSO, AS SHOWN IN FIGURE 6, THE ENTIRE EXHAUST FLOW FROM THE AUXILIARY BUILDING AND OTHER AREAS ARE MONITORED BY FLOW
-MONITORS LOCATED IN THE PLANT VENT STACK. THE FLOW FOR EACH TUNNEL IS INDICATED AND RECORDED ON THE LOCAL CONTROL PANEL.
THE FLOW. MONITORS ALSO PROVIDE A SIGNAL TO THE RADIATION DETECTION CABINENTS.
B. CONTROL ROOM MAKE-UP AIR FILTERS EACH MAKE-UP-AIR FILTER UNIT OF THE CONTROL ROOM IS PROVIDED WITH THE FOLLOWING, ASSURING THAT PROPER FLOW IS MAINTAINED:
- 1. HIGH AND LOW aP ALARMS FOR FANS ON MCP WHICH ARE ALSO LOGGED BY SEQUENCE OF EVENTS R'ECORDER IN THE C0HTf0ER00M.
26
E 1 CEC 0pESPONSE(CONT'D)-
- 2. FANLPRESSURE DIFFERENTIAL INDICATION AND FLOW INDICATION ON-THE LOCAL 1 CONTROL PANEL (LCP), WHICH IS LOCATED IN THE
- HVAC EQUIPMENT ROOM THAT IS PART OF THE CONTROL ROOM
- BOUNDARY. ANY UPSET CONDITIONS IN THE SYSTEM WILL CREATE
~
HIGHERLORLOW$RAPTHANTHENORMALAP'ACROSSTHEFANAND '
IS ALARMED!FOR.0PERATOR'S ACTION.
~
A RADIATION MONITOR IS ALSO PROVIDED IN-THE DISCHARGE DUCT-WORK DOWNSTREAM OF EACH FAN, WHICHLWOULD ALSO PROVIDE THE MEANS 11) DETECT AN INCREASE IN MAKE-UP AIR RADI0 ACTIVITY ?
LEVELS DUE.T0 SYSTEM UPSETS. _
ww
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-\.
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PROPOSED FSAR REVISIONS
-2.G' ALL ESF FILTER SYSTEMS HAVE LOCAL CONTROL PANEL AIRFLOW IliDICATI0ii. IN ADDITION, THE FLOW RATE IN EACH OF THE STACKS 13 RECORDED AT THE LOCAL CONTROL-PANEL. THE AIRFLOW RATE THROUGH THE CONTROL ROOM lEMERGENCY MAKE-UP AIR FILTER UNITS AND THE AUXILIARY BUILDING AliD FUEL HANDLING BUILDING EXHAUST CHARC0AL B0OSTER FANS IS CONTINDUSLY SENSED.
THE DIFFERENTIAL PRESSURE ACROSS ALL OF THE ESF FILTE FANS'IS INDICATED ON LOCAL C0i1 TROL PANELS. HIGH AND LOW DIFFERENTIAL PRESSURE AND Fall TRIP ANNUNCIATION IS PROVIDED ON THE MAIR CONTROL PANEL.
THE DIFFERENTIAL PRESSURES ACROSS ALL HEPA FILTERS ARE l
INDICATED ON LOCAL CONTROL PANELS. IN ADDITI0li, THE PRESSURE DROP ACROSS THE HEPA FILTERS UPSTREAM 0F CHARC0AL FILTERS IS RECORDED IN THE MAIN CONTROL ROOM.' HIGH DIFFERENTIAL PRESSURE ACROSS ALL HEPA FILTERS IS ANNUliCIATED ON THE MAIN CONTROL PANEL AND Oli LOCAL C0i1 TROL PANELS. UPSET CONDITIONS WILL THEREFORE BE IDENTIFIED TO THE CONTROL ROOM OPERATOR i ALLOWING HIM T0 TAKE THE APPROPRIATE ACTION. -
THE AUXILIARY BUILDING EXHAUST FLOW RATE AND FUEL HAliDLING BUILDING EXHAUST FLOW RATE IS CONTINUOUSLY SENSED BY THE E EXHAUST STACK AIRFLOW MEASURING EQUIPMEliT AND RECORDED IN A LOCAL CONTROL PANEL AND BY THE PLANT COMPUTER. ,.
l 31
E ..
,y ' .
NRC GENERIC LETTER 83-13 .
CLARIFICATION OF SURVEILLANCE REQUIREMENTS FOR HEPA FILTERS AND CHARC0AL ADSORBER UlilTS IN STANDARD TECHNICAL SPECIFICATIONS ON ESF CLEAN-UP SYSTEMS (SEE ATTACHED),
CEC 0 RESPONSE WE CONCUR WITH NRC GENERIC LETTER 83-13, PROPOSED FSAR REVISION (REGULATORY GUIDE 1,52 AND 1,1140 POSITION SC AND SD .
THE IN-PLACE DOP TEST FOR HEPA FILTERS AND R-12 TEST FOR ACTIVATED CHARC0AL ADSORBERS WILL CONFORM TO SECTION 10 AND SECTION 12 0F ANSI N510-80,RESPECTIVELY, TO VERIFY THAT THE CLEAN-UP SYSTEM SATISFIES THE IN-PLACE PENETRATION AND BY-PASS LEAKAGE TESTING ACCEPTANCE CRITERIA 0F LESS THAN 0.05%, APPLICABLE WHEN A HEPA FILTER OR CHARC0AL ADSORBER EFFICIENCY OF 99% IS ASSUMED, OR 1%
WHEN A HEPA FILTER OR CHARC0AL ADSORBER EFFICIENCY OF 95% IS ASSUMED, D
m 32
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- / %g UNITED STATES
! n NUCLEAR.REGlR.ATORY COMMISSIO,N
'{ :f WASHING TON, D. C. 20555
~
k ... /
e March 2, 1933
-TO ALL APPLICAIlTS FOR OPERATING LICENSES AND HOLDERS OF CONSTRUCTION .
PERMITS FOR POWER REACTORS -
Gentlemen:
SUBJECT:
CLARIFICATION OF SURVEILLANCE REQUIREMENTS FOR HEPA FILTEPS' AND CHARC0AL ADSORBER UNITS IN STANDARD TECHNICAL SPECIFICATI0.1S
.ON ESF CLEANUP SYSTEMS (Generic Letter No. 83-13)
It has come to our attention that the Surveillance Requirements for HEPA
. filters and charcoal adsorber units in ESF atmospheric cleanup systems as stated in.the' Standard Technical Specifications (STS) in use by applicants for operating licenses require clarification. The current revisions of the STS for all power reactors do not clearly reflect the required relationship between the guidance provided in Regulatory Guide 1.52, Revision 2, and ANSI H510-1975; the testing requirements of the HEPA filters and charcoal adsorbers units; and the flRC staff assumptions used in its safety evaluations
.for the ESF atmospheric cleanup systems. In order to clarify this relation-ship, the wording in the Surveillance Requirements for testing the HEPA filters and charcoal adsorber un,its has been modified.
We have enclosed the revised testing requirements for HEPA filters and char-coal adsorber units in ESF atmospheric cleanup systems that are to be used in your. submittal of proposed Technical Specifications, or, if your proposed Technical Specifications have already been submitted, the staff will make the necessary revisions. These changes will also be incorporated in the
, next' revision of the STS. The generic changes are indicated by a line in the margin of the Surveillance Requirement. Specific ESF atmospheric cleanup systems have not been indicated since the changes apply only to the testing
~o f HEPA filters and char' coal adsorber units in every ESF atmospheric cleanup system.
This request has been approved by OMB Clearance Number 3150-0011, which expires April 30, 1985.
. Sincerely,
~
c;... .. C . y' k barrell G. Eisenhut, Director g, Division of Licensing
Enclosure:
" Revised Surveillance Requirements -
for Testing of HEPA Filters and
. Charcoal Adsorber Units" ,
t 8303020321 33
.. s. ^
,y [ .- EhCLOSURE ,
Revised Surveillance Reauirements for Testino'of HEPA Filters and Charcoal Adsorbers Units 1.. At least once per 18 months, or (1) after any structural maintenance on the HEPA filter or charcoal adsorber housings, or (2) following painting, fire, or chemical release in any ventilation zone communicating with the .
system,:by: -
- 1) Verifying that the cleanup system satisfies the in-place penetration and bypass leakage testing acceptance criteria of less than (*)% and uses the test procedure guidance in Regulatory Positions C.S.a. C.S.c.
and C.S.d of Regulatory Guide 1.52, Revision 2., March 1978, and the system flew rate is efm i 10%.
- 2) Verifying, witSin 31 days after removal, that a laboratory analysis of a representative carbon sample obtained in accordance with Regulatory '
Position C.6.b of Regulatory Guide 1.52, Revision 2, March 1978, meets the laboratory testing criteria of Regulatory Position C.6.a of Regulatory Guide 1.52, Revision 2, March 1978, for a methyl iodide
. penetration of less than (**)%; and
~
- 3) No change After every. 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of charcoal adsorber operation, by ve'rifying, within '
- ~ 2.
31 days.after removal, that a laboratory analysis of a representative carbon sample obtained in accordance with Regulatory Posi. tion C.6.b of Regulatcry
. Guide 1.52, Revision 2, March 1978, meets the laboratory testing criteria of Regulatory Position C.6.a of Regulatory Guide'1.52,' Revision 2, March 1978, for a methyl iodide penetration of less than (**)%.
- 3. After'each compir ce or partial replacement of a HEPA filter bank, by verifying that the HEPA filter bank satisfies the in-place penetration and bypass leakage testing acceptance criteria of less than ('*)% in accordance with A'tSI N510-1975 for a DOP test aerosol while operating the system at a flow rate of cfm 110%. '. *
- 4. , After each complete or. partial replacement of a charcoal adsorber bank, by verifying that the charcoal adsorber bank satisfies the in-place penetration and bypass leakage testing acceptance criteria of less than (*)% in acccrdance with ANSI N510-1975 for a halogenated hydrocarbon refrigerant test gas while operating the system at a flow rate of cfm i 10%.
- . 0.05% value appltcable when a HEPA filter or charcoal adsorber efficiency mf 99% is assumed, or 1% when a HEPA filter or charcoal adsorber efficiency of 95% or less is assumed in the f1RC staff's safety evaluation. (Use the -
value assumed for the charcoal adsorber efficiency if the value for the
.HEPA filter is different from the charcoal adsorber efficiency in the f.RC staff's safety evaluation).
0.175% value applicable when a charcoal adsorber efficiency of 99% is assumed, or 1% value applicable when a charcoal adsorber efficiency of 951 is ' assumed, or 10% value applicable when a charcoal adsorber efficiency
- . - of 90% is assumed in the flRC staff's saf ety evaluation.
e < . .
NRC COMMENT #5 (REGULATORY GUIDE 1,52, POSITION 2.1)
~ '
"THE STAFF...C0NCERNED AS TO HOW THE APPLICANT CAN ASSURE THAT THE FLOW RATE IN VARIOUS ECCS PUMP ROOM CUBICLES IS MAINTAINED DURING THE COURSE OF AN ACCIDENT S0 THAT ADEQUATE COOLING OF
-EQUIPMENT.0CCURS WHEN THE DUCTWORK WILL NOT BE LEAK TESTED AND .
FLOW DISTRIBUTION MAY VARY, THEREBY NEGATING COOLING ASSUMPTIONS."
"THE STAFF IS ALSO CONCERNED AS TO THE POTENTIAL IMPACT UPON THE VALIDITY OF THE APPLICANT'S ANALYSIS TO SHOW THAT M0ISTURE SEPARATORS ARE NOT REQUIRED FOR THE WON-ACCESSIBLE AREA FILTRATION SYSTEM, THE APPLICANT SHOULD ADDRESS THESE POTENTIAL IMPACTS."
CEC 0 RESPONSES THE DUCT IN-LEAKAGE WILL NOT AFFECT THE COOLING 0F ECCS PUMP ROOM CUBICLES, BECAUSE THECE CUBICLES ARE PROVIDED WITH INDIVIDUAL CUBICLE COOLERS. THE EFFECT OF IN-LEAKAGE ON M0ISTURE SEPARATOR ANALYSIS FOR NON-ACCESSIBLE AREA FILTRATION SYSTEM IS ADDRESSED IN THE RESPONSE TO NRC COMMENT #3, PROPOSED FSAR REVISION SEE PROPOSED REVISIONS TO NRC COMMENT #3,
=
\.
35
,f " ' ,
111.3' 'GASEQUS WASTE MANAGEMENT SYSTEMS NRC COMMENT #1:(REGULATORY GUIDE 1.140, POSITION 5B)
"...THE STAFF FINDS IT ACCEPTABLE NOT TO PERFORM AIRFLOW DISTRIBUTION AND AIR-AEROSOL MIXING TESTS ON THE NON-ENTRY TYPE FILTER Ui11T...THEREFORE, THE EXCEPTION TO THIS '
REGULATORY POSITION IS ACCEPTABLE."
~
CEC 0 RESPONSE: CONCUR FSAR REVISION - NOT CHANGE TO EXCEPTION REQUIRED.
NRC COMMEliT #2 (REGULATORY GUIDE 1.140, POSITION 2 F AND 3.F)
"THE CONCERNS OF THE STAFF WITH RESPECT TO THE FILTER HOUSING TESTliiG ARE ESSENTIALLY THOSE DISCUSSED IN SECTI0il 6.5.1 0F THIS SAFETY EVALUATION REPORT. THEREFORE, THE FILTER HOUSING NEED (10T BE TESTED PROVIDED THE MOUi1 TING FRAME IS LEAK TESTED." ,
~~
' CEC 0 RESPONSE -
THE MOUllTING FRAMES WILL BE LEAK TESTED. THE EXCEPTI0llS TO REGULATORY POSITIONS 2.F mo 3 F 0F REGULATORY GUIDE 1.140 HAS BEEN REVISED TO CLARIFY THIS AS FOLLOWS:
\
t 36
NRC COMMENT # 2 (CONT'D)
PROPOSED FSAR REVISION FILTER HOUSINGS ALL iiON-ESF FILTER HOUSINGS, EXCLUSIVE OF THE TECHNICAL SUPPORT CENTER AND POST-LOCA PURGE UNITS, ARE AT NEGATIVE .
PRESSURE WITH RESPECT TO THEIR SURROUNDINGS, AND ARE LOCATED IN AREAS WHICH ARE LOW AIRBORNE RADIATION ENVIRONMENTS. ANY lil-LEAKAGE WILL NOT ADVERSELY AFFECT APPEiiDIX 1 RELEASES, HENCE, THE HOUSINGS WILL NOT BE LEAK TESTED TO THE ANSI H509-76 REQUIREMEi1TS. HOWEVER, ALL THE FILTER MOUNTliiG FRAliES WILL BE LEAK TESTED. THE TECHNICAL SUPPORT CENTER UNIT HOUSING IS LOCATED IN AN AREA WHERE THE AIRBORNE RADIATION LEVEL OF THE ROOM AIR MAY EXCEED THAT OF THE AIR WITHIN THE HOUSlHG: HOWEVER, IT IS AT POSITIVE PRESSURE WITH RESPECT TO THE SURROUNDlWGS, HENCE, IT WILL NOT BE TESTED TO ANSI ii509-76 REQUIREMENTS. THE FILTER MOUNTING FRAMES WILL BE LEAK TESTED.
THE POST-LOCA PURGE UNIT HOUSlilG WILL BE LEAK TESTED TO AllSI N509-76 REQUIREMENTS.
e
\
37
v J .. .
- NRC COMMENT #3'(REGULATORY GUIDE 1.140, POSITION 2F AND 3F)
- A. "THOSE NEGATIVE PRESSURE SECTIONS OF DUCTWORK WHICH SUPPLY AIR TO FILTER SYSTEMS WHICH CONTAIN CHARC0AL ADSORBER UNITS SHOULD BE-LEAK TESTED BECAUSE THESE FILTER SYSTEMS MAY BE DRAWING THROUGH LEAKAGE AIR WHICH CONTAINS PAINT -
FUMES,_VARIOUS ORGANICS, INDUSTRIAL POLLUTANTS, SM0KE, ETC., WHICH COULD POISON THE CHARC0AL'.~ THEREFORE, THE-DUCTWORK UNDER NEGATIVE PRESSURE WHICH SUPPLIES AIR TO SYSTEMS CONTAINING CHARC0AL ADSORBERS SHOULD BE LEAK TESTED IN ACCORDANCE WITH ANSI N509-1980.
B. FURTHERMORE, 'IN ACCORDANCE WITH ANSI /ASME M509-1980, ALL DUCTS MUST BE SUBJECTED T0 A QUANTITATIVE MEASUREMENT l -OF LEAKAGE UNLESS THE DUCT IS LOCATED WITHIN A CONTAMINATED
, SPACE OR PROTECTED SPACE (AS DEFINED IN ANSI /ASME N509-1980) OR HAS A LENGTH OF THIRTY FEET OR LESS MEASURED l _
L EITHER FROM THE FAN 0R'THE AIR CLEANING UNIT TO ITS
. TERMINUS. THE ALLOWABLE LEAK RATES FOR THE DUCTS SHOULD BE IN CONFORMANCE WITH SECTION 4.12 0F ANSI N509-1980.
l FOR THOSE SYSTEMS WHICH DO NOT HAVE CHARC0AL ADSORBERS, LEAK TESTING 0F DUCTS SHOULD BE EVALUATED ON A CASE BY l CASE BASIS, FOR POSITIVE PRESSURE DUCTWORK, THE LEAK RATE TESTING 0F DUCTWORK SHOULD BE ADDRESSED ON A CASE I BY CASE BASIS. HOWEVER, THE DUCTS WHICH ARE NOT QUANTITATIVELY TESTED SHOULD BE THOSE EXCLUDED BY L . ... SECTION 5.10.8 0F ANSI N509-1980.
- 38
- e
h.& ,. .
E NRC COMMENT #.3 (C0NT'D1 _ . . ._ .
CEC 0 RESPONSE ~
~
. THE ATTACHED TABLE' IDENTIFIES THE REGULATORY GUIDE l'140
, FILTER UNITS AND CHARC0AL AND/0R HEPA FILTRATION PROVIDED'.
.-FOR EACH FILTER' UNIT JUSTIFICATION IS SHOWN FOR EXCLUDING TESTING BASED ON ANSI 1N509 EXCEPTIONS NOTED IN ARTICLE 5.10.8; IN' ADDITION, ADDITIONAL JUSTIFICATION IS GIVEN FOR THOSE UNITS.WHICH DO NOT MEET THE CRITERIA IN N509 BUT FOR WHICH LEAKAGE WILL NOT BE SIGNIFICANT.EN0 UGH TO AFFECT DOSE EXPOSURES.
.THE F0LLOWING RESPONDS TO THE SPECIFIC NRC COMMENTS NOTED AB0VEi-A. FROM THE-ATTACHED TABLE, IT CAN BE SEEN THAT THE NEGATIVE PRESSURE "DUCTWORK" FOR ALL FILTER UNITS
-CONTAINING CHARC0AL ABSORBERS ACTUALLY'HAVE SCHEDULE TO PIPING IN LIEU OF SHEET METAL DUCT, EXCEPT' VOLUME' REDUCTION AND TSC FILTER UNITS VOLUME REDUCTION DUCT--
WORK IS LESS,THAN APPROXIMATELY THIRTY FEET AND WITHIN THE RADWASTE BUILDING. LEAKAGE WOULD BE MINIMAL DUE TO THE LENGTH OF DUCT. THE TSC DUCTWORK IS TOTALLY WITHIN-
.THE TSC EQUIPMENT AREA AND NORMALLY IN0 PERATIVE. HOWEVER, A CHEMICAL RELEASE.0R FIRE WOULD HAVE TO OCCUR WITHIN THE
- EQUIPMENT ROOM TO HAVE.ANY POTENTIAL EFFECT AT ALL.
39
( -l~
y n.; _
~
I NRC COMMENT #3 (CONT'D)
CEC 0: RESPONSE (CONT'D)
^B.
FROM TABLE 1.IT IS CLEAR THAT THE ONLY DUCTS WillCH NEED B TESTED ARE THE LABORATORY EXHAUST FILTER UNIT POSITIVE
~
~
PRESSURE: DUCT-0UTSIDE THE EQUIPMENT ROOM AND THE RADWAS BUILDING EXHAUST FILTER UNIT POSITIVE PRESSURE DUCTWORK WHICH IS WITHIN THE AUXILIARY BUILDING, DUCTWORK FOR THE RADWASTE BUILDING EXHAUST FILTER UNIT WILL BE TESTED PRIOR TO VOLUME REDUCTION SYSTEM BEING PLACED IN OPERATION, THE
~
- REMAINING SYSTEMS' DUCTWORK MEET ANSI H509 EXCEPTION CR.ITERIA-AS NOTED AND HAVE NEGLIGIBLE IMPACT ON ALARA PRACTICES AND, THEREFORE, DO NOT WARRENT DETAILED LEAKAGE TESTING. ALL~ SYSTEMS ARE, HOWEVER, INSPECTED DURING INSTALLATION, AIRFLOW RATES BALANCED, AND GROSS LEAKAGE -
RESOLVED, e
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er 9
s a.
L10
Table 3 ,
REGUIATORY GUIDE 1.140
- EFFLUENT TREATMENT FILTERS DUCT LEAKAGE TEST EXCEPTIONS
- l N509 Exception Duct Filter Unit Art. 5.10.3 Press. Reason Off-Gas (a) Hard pipe on suction and discharge except for (HEPA & Charcoal) <30 feet of transition duct.
Laboratory Exhaust *- P Test positive pressure duct outside equipment room.(1)
(HEPA) (c) N Inleakage into duct. Space has MPC less than duct.
Radwa,ste Building
- Positive pressure duct will be tested. ( )
P (HEPA) (c) N Negative pressure ducts go through radwaste darmdng station and radwaste filter cubic.le. No leakage bypasses filters.
., Volume Reduction ( P Positive pressure duct less than approx. 60 feet.
Ed (HEPA & Charcoal) (gp ic) N Negative pressure passing through contaminated / clean interspace with MPC <l.l. Duct length approx.
30 ft.
Normal Purge (b) P Passes through clean interspace with duct concen.
(c) N Negative pressure duct passes through clean interspace. Space has MPC less than duct.
Post-LOCA Purge -
P Not used during normal operation. Discharges to (HEPA & Charcoal) normal purge exhaust, only used as backup to redundant recombiner, 3 days after accident. T1ow rate 1/100 of normal flow, duct length approx.
60 ft.
(c) N Hard pipe on suction' side - routed through clean area.
4
a e.
NT09 -
y
'?'
Exception Duct
- Filter Unit Art. 5.10.8 Press. ,
Reason -
Containment Recirc. (a)
Within contaminated space-and no ductwork.
(IIEPA & Charcoal) l .
.TSC Supply P (HEPA & Charcoal)
Leakage from positive pressure ducts is clean air. Room pressurization is sensed and maintained. Thus, no effect on health p?.ysics.
N Negative test pressure duct outside protected space where inleakage would not normally be filtered.
Tank Vent (a)
(HEPA & Charcoal)
P Ponitive pressure duct less than 30 ft.
(c) -
N Hard pipe is used - all welded - no leakage.
V
/
S 9
J. .
- FSAR REVISIONS i
ALL OF THE DUCTWORK UPSTREAM 0F THE NON-ESF FILTER UNITS IS U NEGATIVE PRESSURE WITH RESPECT TO ITS SURROUNDINGS. DUCTWORK UPSTREAM 0F THE FILTER UNITS IS LOCATED IN AREAS OF LOW AIRBO RADI0 ACTIVITY, ANY IN-LEAKAGE WILL NOT ADVERSELY AFFECT APPENDIX I RELEASES, HENCE, IT WILL NOT BE TESTED TO THE ANSI N509-76 REQUIREMENTS.
ANY DUCTWORK SECTIONS WHERE LEAKAGE WOULD AFFECT THE HABITABILITY OF THE CONTROL ROOM OR TSC WILL BE TESTED TO TH N509-76 REQUIREMENTS.
THE DUCTWORK UPSTREAM 0F THE TSC FILTER UNIT IS LOCATED IN THE EQUIPMENT ROOM.
THE QUALITY OF THE EQUIPMENT ROOM ENVIRONMENT IS THE SAME AS THAT OF THE OUTSIDE AIR WHICH IS WITHIN THE DUCT.
ANY IN-LEAKAGE WILL BE FILTERED PRIOR TO ITS RELEASE TO THE TSC ENV f MENT, HENCE, THIS DUCTWORK WILL NOT BE TESTED TO THE ANSI H509-76 REQUIREMENTS.
POSITIVEPRESSUREDUCTWORKFORTHELABORATdRYEXHAUSTFILTERUNI OUTSIDE THE LABORATORY HVAC EQUIPNENT ROOM AND THE POSITIVE DUCTWORK RADWASTE BUILDING EXHAUST FILTER UNIT IN THE AUXILIARY BUILDING WILL BE LEAK TESTED TO ANSI N509-80 REQUIREMENTS. ALL REMAINING DUCTWORK MEETS THE EXCEPTION OF ANSI N509 OR HAVE tlEGLIGIBLE IMPACT ON ALARA PRACTICES AND THEREFORE, WILL NOT BE LEAK-TESTED. POSITIVE PRESSURE RADWASTE BUILDING EXHAUST DUCTWORK IN THE AUXILIARY BUILDING WILL BE TESTED BEFORE THE RADWASTE VOLUME REDUCTION SYSTEM IS PUT INT 0 OPERATION.
43
s ATTACHMENT C FSAR REVISIONS Appendix A Discussions of Regulatory Guides 1.52 and 1.40 9349N
.? -
o, _3.
, B/B-FSAR MOMM #
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REGULATORY GUIDE 1.52
, Cs> '
Revision 2, March 1978 DESIGN, TESTING AND MAINTENANCE CRITERIA FOR .
ENGINEERING-SAFETY-FEATURE ATMOSPilERE CLEANUP SYSTEM AIR FILTRATION AND ADSORPTION UNITS OF -
LIGilT-WATER-COOLED NUCLEAR PONER PLANTS The Applicant complies with the Regulatory Poaition with the following comments and exceptions keyed to paragraph numbers in Section C of the Position:
1.e (Deleted) (Note 1)-
2.a Entrained water droplets are not considered credible due to significant quantities of ductwork with olbows.
Water droplets, if present, will impinge on ducts and drop out of vertical duct risers as the air enters exhaust plenums. However, the auxiliary building exhaust system
.i does contain profilters which can serve as demisters.
O 2.d (Deleted) (Note 1) 2.f The Auxiliary Duilding non-accessiblo area oxhaunt filtor system consists of throo built-up filtor trains (ono standby) with a capacity of 66,900 cfm each. For maintenanco purposos cach train in divided into throo banks with each bank sized for savon filters wido and throo high.
The Auxiliary Duilding Acconsible area oxhaust filtor syntom has a capacity of 162,300 cfm. This syntom consists of four built-up filter trains (ono standby) and each train is divided into three banks. Each bank is sized for savon filters, wide and throo filtern high.
2.g All ESF filtor systems have local control panol airflow indica tion. In addition, the flow rato in each of the atacks is recorded at the local control panol. The airflow rato through the control room cmergoney mako-up air filtor units and the Auxiliary Duilding and Fuol !!andling Duilding oxhaust charcoal boostor fano in continously sonnod.
.The differential prosauro acrono all of the ESP filtor unit f ans is indicated on local control panolo. Illgh and low (
dif forential prosauro and fan trip annunciation in providad on the main control panol. The notpoints for low and high ,
difforontial will be auch that flown at +10% of donign flow will be ala ed at the main control panor, pA/O M A1.52-1 -
j?lsPx.60 f1/12JDMcs
' ' ~
. ' CCTo B K A. l'127
- ~
v .
B/B-FSA3 The differential pressures across all IIEPA filters are indicated on local control panels. In addition, the pressurc drop across the I:CPA filters upstream of charcoal filters is recorded in the main control room. ligh differential pressure across all !! EPA filters is annunciated on the main control panol and on local control panels. Upset conditions will thorofore bo identified to the control room operator allowing him to take the appropriato action.
the Auxili.ary Building oxhaust flow rato and Fuel llandling Building exhaust flow rato is continuously sensed by tho exhaust stack airflow measuring equipment and recorded in a local control panol and by the plant computer.
2.j Filtor trains are not designed to be removable from the building as an intact unit. The sizo of the train precludes shipment off-nito and there are no facilities for on-sito disposal of the intact unit. The filter elements are removable and can be disposed of through the solid radwaste system. ,
2.1 Filter flousings All of the Auxiliary Building and Fucl llandling Building exhaust system filter housings are designed in accordance with ANSI M509-76. The housings are at negativo pressure with respect to their surroundings and are located in the Auxiliary Building Gonoral Area, which is a low airborno radiation environment. Any in-loakago from tho general area will not adversely af fect Appendix I rolcason. Ilonce, the housings will not bo leak tonted to the ANSI N509-76 requirements. !!owever, filter mounting framo leak tests will be performed in accordance with ANSI N510-80.
The control Room omorgency mako-up air system filtor housings are designed in accordanco with ANSI N509-76. The filter hounings are at negativo pressure with respect to their surroundings and aro' located within the control room boundary, which is a habitablo environment the same as the control Room. Any in-loakago will be from the control Room environ-mont and, thorofore, will not adversely af fect the quality of that environments llonco, the housingo will not be leak tosted to ANSI N509-76 requirements. !!owever, filter mounting framo leak tests will be performed in accordance with ANSI N510-80.
Dectwork All auxiliary building and-fuel-handling _buildingo exhaunt j
syntom ductwork upstream of the filter unitu in under negativo proncure with respect to its curroundings and in located in the como areas of the buildings corved by the exhaunt systems. Any in-loakago will be filtored prior to dischargo to the atmosphoro, henco, this ductwork will not be tented to ANSI H509-76 requiremonta.
A1.52-2
B/DFSAR
~ .
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G.,x,privic fxMMusT S t sM However, prior to final system turnover, the non-accgssibic exhaust system of the Auxiliary Building !!VAC System will be operated and the ductwork will be visually and audibly checked for leaks.- Leaks will be scaled.
s i All control room emergency makeup air system ductwork '
is located within the control room boundary which is a habitable environment. Any ductwork leakage will not adversely affect the habitability of the environment, hence, this ductwork will not be tested to ANSI N509-76 ,
requirementsy The design airflow quantities for each system will be verified during testing, adjusting and balancing of the systems. Deviations of more than + 10% of the design flow quantities will b,e evaluated iind any disposition !
will be documented.
N'"# cosiral.:F## !# 'd 2.m (Deleted) (Note 1) -tfa, ,, pu.n #ein. 29 intsxnvf ttW Sysk.~ yd A of"M" ## M
- d O 3.b (Deleted) (Note 1) hvL7weAtc., t. art.t AAr g a,gs.,c strues in 3.d (Deleted) (Note 1) g gy , p, 3.e (Deleted) (Note 1) ,
3.h (Deleted) (Note 1) ,
3.1 (Deleted) (Note 1) 4.b The space provided between components is 3 feet from O' the front (or rear) of the components to the nearest obstacle (filter frame or other filter component). This i
allows 3 feet of access betwoon components.
4.c (Deleted) (Note 1) 5.b Airflow distribution tests will be performed to ensure that the airflow through any individual filter element does not exceed 120% of the elements rated capacity.
t
! 5.c (Deleted) (Note 1) 1 Further discussions on this subject can be found in Subsections 9.4.1.2 and 12.3.1.7.
Note 1: Exception to this section in no longer required becauno the Regulatory Guide has been revised to eliminate the criteria to which exception was originally taken.
l i
O ,
A1.52-3
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B/C-FSAR @%oA:isfD AvrAlbstEnr G7ctua rg, /f f$/ #
.() .
REGULATORY GUIDC 1.140 t
Revision 0, March 1978 .
, DESIGN, TESTING AND MAINTENANCE CRITERIA FOR NORMAL VENTILATION EXIIAUST SYSTEM AIR FILTRATION AND
- ADSORPTION UNITS OF LIGHT-WATER-COOLED NUCLEAR POWER PLANTS The design of the non-nafety-related filter systoma moet the requirements of this guido, except as noted below. The excep-tions are keyed to paragraph numbers in the Regulatory Position.
la and Ib - The equipment and components (oxcluding charcoal, filter pada and separator pads) are designed to withstand a maximum of 40-year integrated radi-
. ation dose and wornt-cano anticipated continuous service, rather than 40 years of continuous service.
2a - All of the exhaust filter systems contain prefiltors, HEPA filters, fan and associated instrumentation.
Charcoal adsorbers are only used when iodino O is anticipated to bo prosent, with heators for over 70% relative humidity air streams.
2b - The purge system exhaust filter train is designed for 43,900 cfm. Filter officiency will be tested at tr.is capacity. The filter train consists of two banks with a grating between the filter banks. Each filtor bank is three filters high and seven wide.
2f and 3f - Filter Housings ,
' All ndn-ESF filtor housings, exclusive of the Technical Support Contor and pont-LCCA purgo unitu, are at negativo prennuro with respect to their
, surroundings, and aro located in aroan-which are low airborno radiation environments. Any in-loahago will not advernoly affect' Appondi:r, I relcanon, honco, the housings will not bo lonk tonted to the ANSI N509-76 requiremonta. Howevor, all the filtor mounting framon will bo leak touted. The Technical Gupport Cantor unit housing is located in an area whoro tho airborno radiation levol of the room air may excood that of the air within tho houning: Howover, it in at O ponitivo pronnuro with ronpoct to the nurroundings, honco, it will not bo tonted to ANSI H509-76 requiremonto. The filter mounting framon will ho leak tontod. The pont-LOCA purgo unit housing will bo look touted to ANSI,N509-76 requiremonto.
A1.140-1
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2f Land >.3f - Ductwork y i Alliof 4hekductwork upstream of the non-ESF filter f . ,
0 units is 'und'er. negative pressure with respect to -its x '
surroundings.' Ductwork upstream of the . filter units
. is located in area's: of . low airborne radioactivity. , t Any in-leakage will not adversely affect Appendix I
7 ' releases, hence, pit will not be tested to the ANSI ,
'N509-76 requirements.
. The 'ductwork upstream of fthe, TSC filter unit is 9i' . , located in the INAC Equipment. Room.- The quality of the equipment room environment "is the same as that of N
/ th'e -.outside air which . is' within 'the duct. Any in- '
. leakage will be filtered prior (to its release to the TSC~ environment,.honce, this ductwork will not be
- tested to the ANSI N509-76 rcquirements.
Jo I The following ductwork will be leak tested to the ANSI
>N509-76 requirements:
I 1. Positive pressure ductworkt for the laboratory exhaust filter. unit outside the laboratory HVAC equipment
. room. ,
i . l 2. The positive pre'ssure ductwork fr',an the Radwaste T '/
Building exhaust filter unit in the Auxiliary "I !-
Building.
1
)
The pos'itive pressure' ducsiork from > the volume i3.
I reduction system area ventilation exhaust filter e d h that is located in the ';R'adsaste Building.
-y .
y >
- y. .
- 4. The positive -pressure ductwork from the Post-LOCA '
s '- : purge filter' unit. ;
J 5. ' 'All ncn-safety-related ductwork that is under ,Ta
',3 [U jressure within the Control Room boundary..
^
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73C,: negative ' pressure duct sections outside the /'
4,+ .
protected space where in-leakage would not normally- /'
3 N wl ~be filtered, w /f , 3 ..
q; . All~ remaining ductwork meets the ex'ception of ANSI N509 i
y orf have negligible ~ impact on ALARA practices and gJN 4 ' therefore, will' not be leak tested.
. Positive pressuhe, iRadwaste Building exhaust ductwork in the Auxiliary >
gJa.
,7 Building will' be ttested before the radwaste volume cy: ,
- X -- . reduction systlein is put into operation. ,
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A1.140-2 t
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3a. The components of the heaters are manufactured and assembled as per Section 5.5 of ANSI N509-76, similar to the require-ments of heaters in safety-related filter systems, but the i
,_r traceability of the components is not established as it '
- would be in the case of safety-related heaters. Thus, no complete qualification program is done, however, all air heaters - (ESF and Non-ESF) are purchased using the same design, construction, and performance specification. A i f C 5b - . Airflow distribution and air-aerosol mixing tests .
will not be performed on the non-entry type filter units. Airflow distribution tests will be per. formed
..- on all entry-type filter trains to ensure that the airflow through~any individual filter element does not exceed 120% of the elements rated capacity.
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)
A1.140-3
, , _ _ , _ _ - - - - - .. _,