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=Text=
=Text=
{{#Wiki_filter:"n                              0                2"*E * #$
{{#Wiki_filter:2"*E * #$
      .                                    mp                                           st co auf N O R T H E: RN   SvATES       POWER       COMPANY Monticello, Minnesota 55362 h
"n 0
il March 25, 1974'                                                                         ij H
mp st co auf N O R T H E: RN SvATES POWER COMPANY h
p N
Monticello, Minnesota 55362 il March 25, 1974' ij Hp N
Mr. J. G. Keppler, Regional Director                                                     M Directorate of Regulatory Operations                                                     i{
Mr. J. G. Keppler, Regional Director M
Region III                                                                               h United States Atcaic Energy Coamission                                                   ji 799 Roosevelt Pcad                                                                         P Glen Ellyn, Illinois 61073 h
Directorate of Regulatory Operations i{
c
Region III h
United States Atcaic Energy Coamission ji 799 Roosevelt Pcad P
Glen Ellyn, Illinois 61073 hc


==Dear Mr. Xeppler:==
==Dear Mr. Xeppler:==
U li IOhTICEL10 NJC114R GENSPJJIhU PLAhT                                 4 Docket No. 50-263 License No. DPR-22                                 $
U li IOhTICEL10 NJC114R GENSPJJIhU PLAhT 4
                                                                                                    ;j As a result of' primary containment isolation valve local leak rate testing perforced     q on M1rch 22, 1974, the following occurrences are hereby reported:                         [
Docket No. 50-263 License No. DPR-22
v
$;j As a result of' primary containment isolation valve local leak rate testing perforced q
: 1. The "A" Core Spray System testable check valve, AD 14-13A, was found to be           (
on M1rch 22, 1974, the following occurrences are hereby reported:
icaking 290 SCOf. Tnis is in excess of the acceptance criteria for local             i icak rate tests specified in section 4.7.A.2.f. of the TeCmical Specificatiens,       j The redundant isolation valve in this line, 10 1753, was found to have zero           d Icakage. An investigation into the cause of the leakage past AD 14-11; will           h be conducted prior to retuming to pcuer operatien.                                   i 1
[v 1.
: 2. It took an excessive arctmt of tice to pressurize the area between Printry           '
The "A" Core Spray System testable check valve, AD 14-13A, was found to be
Centairacnt Atrospheric Control Systcn isolatica valves, A0 2377, A0 2373 and         j AD 23S1 until a pressure of cpprcxicately 25 psig was obtained. At 25 psig,           !
(
  ;            the Icakage appeared to. stop and the voltme was pressurized to the recuired         i 41 psig test pressure in a reasonable tina interyc1 ccasidering the voltre of       (
icaking 290 SCOf. Tnis is in excess of the acceptance criteria for local i
l               the area being pressuri:cd. A local leak vate test perforced at 41 psig indicated
icak rate tests specified in section 4.7.A.2.f. of the TeCmical Specificatiens, j
: j.           a total Icakage rate of only 4.6 SCFH ficm the three valves. The voltne was         :j j            depressurized and tha Icak test was repeated with similar results. The initial         j investigaticn of the occurrence revealed that there was significant s:umt of IcaLge past A0 2381 tutil a pressure of approxirately 25 psig was attained, at       ;
The redundant isolation valve in this line, 10 1753, was found to have zero d
              . which tim Icakage past the valve appeared to cease. . Corrective actions to be       j taken on this valve will be detemined following cc::pletion of the occurrence investigation.
Icakage. An investigation into the cause of the leakage past AD 14-11; will h
l s3o6200349 740325 PDR ADDCK 05000263                         ,11 / go.
be conducted prior to retuming to pcuer operatien.
Yours very truly,       s               PDR                  43          W C.       fE                                                   E Plant Manager CEL/ncra
i 1
                                                          /J@
2.
iAP            u.tuf @9 h,       4 i'
It took an excessive arctmt of tice to pressurize the area between Printry Centairacnt Atrospheric Control Systcn isolatica valves, A0 2377, A0 2373 and j
b        ':)         .M cc: J F O' Leary, Directorate of Licensing                               G3 7/
AD 23S1 until a pressure of cpprcxicately 25 psig was obtained. At 25 psig, the Icakage appeared to. stop and the voltme was pressurized to the recuired i
G Charnoff                 .
41 psig test pressure in a reasonable tina interyc1 ccasidering the voltre of
                ' Minnesota Pollution Control Agency, Attn: E A Pry ina-00        . g:$ -
(
        -  Copie . nt by telecopier to Kenpler and O'Learv           COPY SENT REGION             b
l the area being pressuri:cd. A local leak vate test perforced at 41 psig indicated
:j j.
a total Icakage rate of only 4.6 SCFH ficm the three valves. The voltne was j
depressurized and tha Icak test was repeated with similar results. The initial j
investigaticn of the occurrence revealed that there was significant s:umt of IcaLge past A0 2381 tutil a pressure of approxirately 25 psig was attained, at
. which tim Icakage past the valve appeared to cease.. Corrective actions to be j
taken on this valve will be detemined following cc::pletion of the occurrence investigation.
s3o6200349 740325 l
PDR ADDCK 05000263
,11 / go.
PDR 43 W
Yours very truly, s
C.
fE E
Plant Manager
/J@
: u. f @9 i' CEL/ncra iAP h,
4 b
':)
tu.M cc: J F O' Leary, Directorate of Licensing G3 7/
00
. g:$ -
G Charnoff
' Minnesota Pollution Control Agency, Attn: E A Pry ina-Copie. nt by telecopier to Kenpler and O'Learv b
COPY SENT REGION
.}}
.}}

Latest revision as of 04:00, 14 December 2024

Ro:On 740322,during Primary Containment Isolation Valve Local Leak Rate Testing,Core Spray Valve a Check Valve AO 14-13A Found Leaking in Excess of Tech Spec Limits & Excessive Amount of Time Needed to Pressurize Valve Areas
ML20084S977
Person / Time
Site: Monticello 
Issue date: 03/25/1974
From: Larson C
NORTHERN STATES POWER CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 8306200349
Download: ML20084S977 (1)
v • d • e


Text

2"*E * #$

"n 0

mp st co auf N O R T H E: RN SvATES POWER COMPANY h

Monticello, Minnesota 55362 il March 25, 1974' ij Hp N

Mr. J. G. Keppler, Regional Director M

Directorate of Regulatory Operations i{

Region III h

United States Atcaic Energy Coamission ji 799 Roosevelt Pcad P

Glen Ellyn, Illinois 61073 hc

Dear Mr. Xeppler:

U li IOhTICEL10 NJC114R GENSPJJIhU PLAhT 4

Docket No. 50-263 License No. DPR-22

$;j As a result of' primary containment isolation valve local leak rate testing perforced q

on M1rch 22, 1974, the following occurrences are hereby reported:

[v 1.

The "A" Core Spray System testable check valve, AD 14-13A, was found to be

(

icaking 290 SCOf. Tnis is in excess of the acceptance criteria for local i

icak rate tests specified in section 4.7.A.2.f. of the TeCmical Specificatiens, j

The redundant isolation valve in this line, 10 1753, was found to have zero d

Icakage. An investigation into the cause of the leakage past AD 14-11; will h

be conducted prior to retuming to pcuer operatien.

i 1

2.

It took an excessive arctmt of tice to pressurize the area between Printry Centairacnt Atrospheric Control Systcn isolatica valves, A0 2377, A0 2373 and j

AD 23S1 until a pressure of cpprcxicately 25 psig was obtained. At 25 psig, the Icakage appeared to. stop and the voltme was pressurized to the recuired i

41 psig test pressure in a reasonable tina interyc1 ccasidering the voltre of

(

l the area being pressuri:cd. A local leak vate test perforced at 41 psig indicated

j j.

a total Icakage rate of only 4.6 SCFH ficm the three valves. The voltne was j

depressurized and tha Icak test was repeated with similar results. The initial j

investigaticn of the occurrence revealed that there was significant s:umt of IcaLge past A0 2381 tutil a pressure of approxirately 25 psig was attained, at

. which tim Icakage past the valve appeared to cease.. Corrective actions to be j

taken on this valve will be detemined following cc::pletion of the occurrence investigation.

s3o6200349 740325 l

PDR ADDCK 05000263

,11 / go.

PDR 43 W

Yours very truly, s

C.

fE E

Plant Manager

/J@

u. f @9 i' CEL/ncra iAP h,

4 b

':)

tu.M cc: J F O' Leary, Directorate of Licensing G3 7/

00

. g:$ -

G Charnoff

' Minnesota Pollution Control Agency, Attn: E A Pry ina-Copie. nt by telecopier to Kenpler and O'Learv b

COPY SENT REGION

.

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