ML20091K682

Proposed Tech Specs Section 3.7/4.7 SGTS

ML20091K682
Person / Time
Site:	Monticello
Issue date:	08/18/1995
From:	NORTHERN STATES POWER CO.
To:
Shared Package
ML20091K637	List: ML20091K634 ML20091K673 ML20091K682
References
NUDOCS 9508280119
Download: ML20091K682 (4)

Text

_ _ . - - ._. . . . ..

~

CLA DO CD N Bases Continued: .

E8 B. Standby Gas Treatment System, and C. Secondary Containment Inser4- A gg gy g Initiating reactor building isolation and operation of the standby gas treatment system to [

oo maintain the design negative pressure within the secondary containment provides an adequate f9 test of the reactor building isolation valves and the standby gas treatment system. Periodic 7 gtD testing gives sufficient confidence of reactor building integrity and standby gas treatment u system operational capability. p - --

The frequency of tests and. sample analysis are necessary to show that the HEPA filters and b Y charcoal adsorbers can perform as evaluated. Standby gas treatment system inplace testing 1989 procedures will be established utilizing applicable sections of ANSI N510-10Z%ndard lN as a procedural

-e. ..r. guideline only. Redund;;t h;;;;r; in th; ;t;;24 g;; tz;; r nt ;j; ::  :::; Y pr.,,..,.

d.via._.7 - % .arerbent.. If painting, fire, or chemical release occurs .I

!g such that the HEPA filter or charcoal adsorber could become contaminated from the fumes, e chemicals, or foreign materials, the same tests and sample analysis should be performed as required for operational use.

Ib Replacement adsorbent should be qualified according to the March guidelines of Re6ulatory Guide 1.52 Revision 2/ (Jer4 1976). The charcoal adsorber efficiency 1976 test procedures will allow for the removal of ene. representative sample - r*-'d- . tThe sample will be at laut two inches in diameter and a IJttgth equal to the thickness of the bed. If the iodine ~

be replaced. aval efficiency test results are unacceptable, all adsorbent in the system will High efficiency particulate filters are installed before and after the charcoal filters to prevent clogging of the carbon adsorbers and to minimize potential release of particulates to the environment. An efficiency of 994 is adequate to retain particulates that may be released to the reactor building following an accident. This will be demonstrated by bA$

tge, inplace testing with DOP as the testing medium. Any HEPA filters found defective will be

,- C O, replaced with filters qualified pursuant to regulatory guide position C.3.d of Regulatory l */6 g g Guide 1.52 RevisionN (Juned94). Once per operating cycle demonstration of HEPA filter 1978 pressure drop, operability of Q heaters at rated power, automatic initiation of each standby gas treatment system circuftI and leakage tests after maintenance or testing which could affect leakage, is necessary to assure system performance capability.

T he 30t > FIo gg -4 Q hsk mCJNod " O V*Yoh *CSIU N +"hA wC AW Y D PW 4.7 BASES i a d i n e_. removed eShc.y e8r +he. o35Nb e M -

188 REV 52 1/0/01

T Insert Text A for Monticello Technical Specification Bases Page 188 -

Secondary Containment Capability Test data cbtained under non-calm conditions is to be extrapolated to calm wind conditions using information provided in " Summary Technical Report to the United States Atomic Energy Commission,-

Directorate of Licensing, on Secondary Containment Leak Rate Test", submitted by letter dated July 23,1973,'and as described in NSP letter to the NRC dated August 18,1995, with subject, " Revision 2 to License Amendment Request Dated June 8.1994, " Standby Gas Treatment and Secondary Containment Technical Specifications."

6 i

i

)

- - . - _ _ - - . ~ . - _ . . . _ - - . . - - - . - _ - - - . _ _ _ - . _ - - - - _ - - - _ . - - - - - - _ _ _ _ _ _ _ - - + =. .~. .~r n , . . . , .

9

. . . . ~.

L Exhibit C

' Monticello Nuclear Generating Plant P

^

Revision 2 to License Amendment Reauest Dated June 8.1994 Revised Technical Specification Pages  ;

I Exhibit C consists of the Technical Specification pages with the proposed changes

. . Incorporated. Existing pages affected by this change are listed below:

9 188 l l

l>

p l

C 1 ,

~.

. t Bases Continued I B. Standby Gas Treatment System, and C. Secondary Containment ,

Initiating reactor building isolation and operation of the standby gas treatment system to maintain the -

design negative pressure within the secondary containment provides an adequate test of the reactor building isolation valves and the standby gas treatment system. Periodic testing gives sufficient confidence of reactor building integrity and standby gas treatment system operational capability. Secondary Containment Capability Test data obtained under non-calm conditions is to be extrapolated to calm wind conditions using

! information provided in " Summary Technical Report to the United States Atomic Energy Commission, Directorate of Licensing, on Secondary Containment Leak Rate Test", submitted by letter dated July 23, 1973, and as j described in NSP letter to the NRC dated August 18, 1995, with subject, " Revision 2 to License Amendment l Request Dated June 8,1994, Standby Gas Treatment and Secondary Containment Technical Specifications."

The frequency of tests and sample analysis are necessary to show that the HEPA filters and charcoal ,

I adsorbers can perform as evaluated. Standby gas-treatment system inplace testing procedures will be established utilizing applicable sections of ANSI N510-1989 standard as a procedural guideline only. If I ,

painting, fire, or chemical release occurs such that the HEPA filter or charcoal adsorber could become l contaminated from the fumes, chemicals, or foreign materials, the same tests and sample analysis should be j - performed as required for operational use. Replacement adsorbent should be qualified according to the ,

! guidelines of Regulatory Guide 1.52 Revision 2 (March 1978). The charcoal adsorber efficiency test l j procedures will allow for the removal of a representative sample. The 30*C, 95% relative humidity test per ASTM D 3803-89 is the test method to establish the mythel iodine removal efficiency of the' adsorbent. The j sample will be at least two inches in diameter and a length equal to the thickness of the bed. If the  ;

iodine removal efficiency test results are unacceptable, all adsorbent in the system will be' replaced. High  ;

efficiency particulate filters are installed before and after the charcoal filters to prevent clogging of the carbon adsorbers and to minimize potential release of particulates to the environment. An efficiency of i

99% is adequate to retain particulates that may be released to the reactor building following an accident.

! This will be demonstrated by inplace testing with DOP as the testing medium. Any HEPA filters found ,

defective will be replaced with filters qualified pursuant to regulatory guide position C.3.d of Regulatory Guide 1.52 Revision 2 (March 1978). Once per operating cycle demonstration of HEPA filter pressure drop, ,

operability of inline heaters at rated power, automatic initiation of each standby gas treatment system .l circuit, and leakage tests after maintenance or testing which could affect leakage, is necessary to assure system performance capability.

4.7 BASES 188 l REV 1 -

i