View source for AECM-86-0052, Application for Amend to License NPF-29,changing Tech Specs to Lower Requirement for Standby Gas Treatment Sys Heaters in Surveillance 4.6.6.3.d.5 to 50 Plus/Minus 5 Kw

{{Adams
| number = ML20141G127
| issue date = 02/17/1986
| title = Application for Amend to License NPF-29,changing Tech Specs to Lower Requirement for Standby Gas Treatment Sys Heaters in Surveillance 4.6.6.3.d.5 to 50 Plus/Minus 5 Kw
| author name = Kingsley O
| author affiliation = MISSISSIPPI POWER &amp; LIGHT CO.
| addressee name = 
| addressee affiliation = 
| docket = 05000416
| license number = 
| contact person = 
| document report number = AECM-86-0052, AECM-86-52, TAC-60700, NUDOCS 8602260167
| package number = ML20141G088
| document type = OPERATING LICENSES-APPLIATION TO AMEND-RENEW EXISTING, TEXT-LICENSE APPLICATIONS &amp; PERMITS
| page count = 4
| project = TAC:60700
| stage = Request
}}

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BEFORE THE UNITED STATES NUCLEAR REGULATORY COMMISSION LICENSE NO. NPF-29 DOCKET No. 50-416 IN THE MATTER OF MISSISSIPPI POWER & LIGHT COMPANY and MIDDLE SOUTH ENERGY, INC.
and SOUTH MISSISSIPPI ELECTRIC POWER ASSOCIATION AFFIRMATION I, O. D. Kingsley, Jr., being duly sworn, stated that I am Vice President, Nuclear Operations of Mississippi Power & Light Company; that on behalf of Mississippi Power & Light Company, Middle South Energy, Inc., and South Mississippi Electric Power Association I am authorized by Mississippi Power & Light Company to sign and file with.the Nuclear Regulatory Commission, this application for' amendment of the Operating License of the Grand Gulf Nuclear Station; that I signed this application as Vice President, Nuclear Operations of Mississippi Power & Light Company; and that'the statements made and the matters set forth therein are true and correct to the          t of my knowledge, information and belief.
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O. W./ king  e-STATE OF MISSISSIPPI COUNTY OF HINDS SUBSCRIBED AND SWORN TO before me, a Notary Public, in and for the County and State above named, this /7//, day of        Fe' 6 r y . u        , 1986.
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No g Public My commission expires:
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==SUBJECT:==
NPE-86/003-
                                                                        -  i   ~ '
                                           - Technical Specification' Surveillance Requirement 4.6.6.3.d.5; K                                         .page 3/4-6-56"          ,
DISCUSSION:              Surveillance Requirement'4.6.6.3.d.5 requires that at least V'            once per 18 months the standby gas treatment: system heaters are
                                           = verified to. dissipate 50 1-5.0 KW when tested in'accordance Mth ANSI N510-1975 :(except for"the phase balance criteria; stated'in'Section 14.2.3). .These1 heaters were tested in March 1985fand were found to dissipate greater than 45 KW.
Sa veillance Requirement 4.6'.6.3.d.5 was again performed,on
                                                                             ~
February 15,.1986 for B Train. -The test results showed~a heat.
dissipatio'n of;1ess than145-KW, which-does'not meet the surveillance requirement.. As a result,.the,B Train;of the-standby'~ gas treatment' system was declared inoperable and entry into' Operational ~ Conditions'1,.2,t 3 and
* was prohibited..
MP&L is requesting by this proposed change that Surveillance.
Requirement 4.6.6.3.d.5.be revised to reflect a' heat-dissipation requirement of 48        SKW.-
JUSTIFICATION: The operability of the standby gas treatment systems within secondary' containment.' ensures that' sufficient iodine         !     removal;
                                         't carability will be available in-th'e eventL-of a LOCA.' 'The ireduction in containment iodineT nventory     i              reduces.the.resulting f[, l
!                                        J site boundary radiation doses associated with containment leakage. The operation of this: system and resultant iodine
,                                             removal capacity are consistent with the assumptions used in i                                             the LOCA analyses. Continuous' operation of-the system with thei heaten/ operable for 10 hours over a 31-day 1 period is' sufficient to rede'ce the buildup of moisture on-the-adsorbers and'HEPA-filters.
                                            ..The heaters originally ins *o 1.ad'in the standbyLgas treatment h                                             system were 50KW nominal W +.pplied by vendor CVI.- These-
$_                              y             heaters were not qua*1 % r s the' requirements:of NUREG 0588 and were subsequently red .:.at' ,- March 1985 with 48 KW nominal'
  ){                                        . heaters-supplied by. vendor Ellis and Watts that'were qualified..
The size;(50 KW nominal)'of the originally.' installed: heaters I        should not be-used as the basis for_the' heat dissipation requirement presently in Surveillance Requirement 4.6.6.3.d.5..                          "
     ~                                        The s' ire ~(48KW nominalc) of. the presently l installed heaters /
should be'used.to form the' basis forJthe value used;in;this                       o?    ,
surveillance. For the SBCT system the'new. heaters'have'been-marginal when:trying to' comply with: Surveillance Req'uirement-4.6.6.3.d.5 to meet:50.i'.5 KW heat. dissipation.$ Alsmall' drop;in:
4
                                             ' incoming line voltage can mean'theJdifference'in p'assingcor failing the; surveillance.             In' order to' solve this problem, MP&L
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5                  ., . n has; performed a calculation-to' determine ~the minimum heat'
:  dissipation.requiredffor'the SBGT system'in order'to meet ~ design;                                          '
requirements. JAs explained;below, the: calculation demonstrates; that a minimumLof approximately 21.5 KW heat dissipation inteach
                                                                        ~
                                    ; SBGT train will reduce the relative; humidity of the air leaving l                                            ,
the heaters to 70%. .The proposed, change:to'48 i 5KW will ensure that design ~ conditions are met.;                         ,
                                                           ~
The calculation to datermine needed heater' size for SBGT assumes; an incoming air temperature of.150'F with 100% relative humidity.
                                                                                  ~
and a SBGT system flowrate of 4500 CFM (4000 CFM required).>-The;
                                                                          ~
                                                                     ~
heaterisize required to reduce.the relative-humidity offthe' air, leaving the-heaters;to 70% is approximately.21.5 KW.; The requirement to reduce-the' relative humidity from 100%.to'70%f under worstJease DBA conditions is.specified~in Regulatory. Guide'
                                                                 ~
1.52 Revision 1.:
2 v.
SIGNIFICANT HAZARDS CONSIDERATION:
The proposed change,to'the technical specifications reduces the-heat dissipation requirement of'the heaters in theLSBGT system from 50 ~5 KW to 48             5 KW. The 50 2 5 KW is based on.the heaters originally installed and.not on the heaters presently:
installed. Regulatory Guide-1.52~ Revision 1. requires"a heater sized to reduce the relative humidity of the incoming air from 100% to 70%.dur'ing postulated DBA conditions.'.The iproposedy48-1.
                                                                                              ~
                                    . 5~KU heat dissipation exceeds these design requirements since a-                                '
minimum of approximately 21.5 KW is all that is required'to':
ensure 70% relative humidityfair leaving the heaters.-
The proposed change does-not involve a significant increase in the probability or consequences of anJaccident.previously evaluated because the propos~ed change to a 48'i 5 KW             ~
meets the' design requirement to lower the~ relative humidity of-the incoming air from 100% to 70% under worst possible DBA.
conditions. This-change reflects'present.as-built system designiwhile still ensuring:that worst case DBA specification
                                                                                                              ~
requirements are met' ~Since thisichange'doesLnot ' adversely-
                                   - affect. previous accident analyses requirements, there is no increase-in the probability or consequences;of an accident:                                                       '
previously evaluated.'                     -
The proposed change,does not c,reate.the possibility,of a new or different. kind of accident 4from any accident previously,.
                                    -evaluated because: calculations indicate that a minimium of.
approximately'21.5 KW is' adequate to ensure 70%. relative
                                  ~ humidity air leaving-the heaters. This change' doe's not affect-                           1 the performance or design intent of'the'SBGT system. heaters.                                                     i Therefore, this change does notiadversely affect the accident analysis and does~not create the' possibility of-a new or different kindiof accidentefrom~any accident.previously evaluated.                                                                                         -
            "J16ATTC86021401 - 2 o_

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                                                                                ~Attschm:nt l'to AECM-86/0052' h:,
The proposed change does not involve.a significant reduction in the. margin of safety because calculations demonstrate that a.
minimum of.approximately 21.5 KW heat dississipation.ic all that is required to ensure-70% relative humidity air = leaving the heaters. The calculation conservatively assumes a SBGT flowrate of 4500 cm when only 4000 CFM is required 'by FSAR.
analysis'_ assumptions. Therefore,.the proposed minimum of 48 1.5 KW is a conservative number with respect.to requirements'and the margin'of safety is not reduced.
Therefore, the proposed change involves no significant hazards considerations.
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