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fDL O                                  UN11ED STATES NUCLEAR REGULATORY COMMISSION IN THE MATTER OF:                                      DOCKET NO: --- 5 o - 3 %
DAVIS BESSE If1CIDEi1T (IliTERVIEW & f1EETIl1G)
(CLOSED)                        -
Discuss PORV Controls and Instrumentation.
O                        .
LOCATION:        OAK HARBOR, OH                        PAGES: 1-9 DATE:      July 9, l985 t
l
  -O                                ACE-FEDERAL REPORTERS, INC.
OfficialReporters 444 North Capitol Street 8507290072 850709                Washington, 'D.C. 20001
                                                                                              )
PDR    ADOCK 0500    6                (202)347-3700 NATIONWIDE COVERACE
 
d 1-2 1                        UNITED STATES OF AMERICA 2                    NUCLEAR REGULATORY COMMISSION 3
4                                ---
5                      TUESDAY, JULY 9, 1985 6                                ---
7 8  MEETING BETWEEN THE NRC FACT-FINDING TEAM AND TOLEDO EDISON 9
TO 10 11 DISCUSS PORV CONTROLS AND INSTRUMENTATION 12                                ---
13        NRC FACT-FINDING MEMBERS PRESENT:
14            ERNEST ROSSI J. T. BEARD 15            LARRY BELL 16        TOLEDO EDISCN MEMBERS PRESENT:
17 MR. ISLEY ig            MS. MacDONALD 19        ALSO PRESENT:
20            MR. HILBEBRAND, MPR 21 22 23
                        -24 Ace-Federci Reporters, Inc.
25                            ,
 
3
      .Sim 4t-1 W
PROCEEDINGS                        (2:40 p.m.)
2                MR. BEARD: ' Let's go back on the record.
3                This is another meeting of the fact-finding team
.                            4    where-we'would like.to get some more detailed information
                          .5    on the operation of the pilot operated relief valve.
6                I guess really what we'want to do is just like 7    we have done in the previous meetings today is throw out 8    a couple of points as part of-our understanding and make 9    sure that we understand it accurately.        That is all.
                          -10                MR. ISLEY:    All right.:      .
11                MR. BEARD:    Let me put this figure along with the 12    record, and I will give you a copy of it also.          It is the 13    same one that is out of the tech manual that you provided 14    us, with one difference, and that is for some of the balloons 15    around the outside, for example, Item No. 3, I have annotated 16    that like a.t. main' disc.  :I put some numbers on it and a 17    couple of things like that, andcI'.have cross-h'atched a couple 18    of the cavities that were mentioned inithe discussion so
                                                                                    ~
19      that they are more readily-apparent.        That is_all.
.                          20                MR..ISLEY:    Okay._  Right..
21                MR. BEARD:    But there has been no change to the 22    diagram.
:23                                      (The document referred to, ' Fig. 1, 1
24                                    Assembly of Pressurmatic Valve Ace-Federal Reporters, Inc.
                                ' ~-
25                                      Style HPV-SN was marked Exhibit l' INDEXL                                                      and submitted for the record.)
  =    .
t              __
 
                                                                ~
        .                                                                                                          l 1
Sim 1262            'j                MR. BEARD:      Now'one of the questions that I had                l 2    was in the description.in the tech manual'of the normal 3    condition of'this with the plant at full power and at the
                          -4 right pressure. So this thing would be closed.
5 MR. ISLEY: . Right.
6              MR. BEARD:      They talk about cavities B, C and D 7    being>all at the same pressure.
8 MR. ISLEY:      Correct.
9              MR. BEARD: - And ~then they say that because the 10      Pressure at the outlet Port E at the top is low, therefore 11      the valve disc is seated.
12                MR. ISLEY:      That is right.
13                  (Discussion off the record.)
ja                MR.' BEARD:      I guess we are back on the record 15      again here.
4
,                          16                What I was trying to get at, Tom, is in the tech 17        manual, as I remember it, it talks about since the pressure 18        at B and C~ cavities is high, and that is system pressure.---
19                MR. ISLEY:      Right.
20                  MR. BEARD:      --- and the cavity at the' outlet E is 21        low,-therefore the valve disc is seated and there is no flow.
22                  MR. ISLEY:      Correct.
23          -      MR. BEARD:      Now it'seemed to me that a better l                                                                                                                -
24        description was that the pressure above and below the valve's
' t Ace-Federal poporters, Inc.                        .          .
25        main disc, in other words,-the pressure.in cavity B is A-  ,        - - - .                  g - - -
                                                                                                        .h  y,,
 
l 5
l
          $0-Sim W -3            1  also somewhat above the disc ---                            J 2            MR. ISLEY:  Right.
3            MR. BEARD:  --- and cavity C is on the underside, 4  those two pressures really balance the main disc and the 5  spring is what keeps.it closed.
6            MR. ISLEY:  Not according to Crosby. Their 7  description of the purpose for Spring C is essentially a 8  shipping holder and just an assist to get the valve closed, 9  and the valve should operate fine with Spring C, or with the 10  spring underneath the disc not even there. If the spring 11  were removed, the valve should work fine.
12            MR. BELL:  So it is a differential area that is 13  holding the main disc closed?
14              MR. ISLEY:  Yes. I think if you were to look at 15  the surface area available in there and compare the two 16  surface areas, you would see that there is more surface area 17  underneath the disc to campensate for that.
18              MR. BEARD:  Okay. So it is the difference not l9  in pressures and really not in E. See, the point I was 20  trying to get at is the pressure in E is not really the 21  driving force for the valve disc as much as it is the 22  pressure on the underside and overside of the main disc.as 23  I thought.
24              MR. ISLEY:  Right.
Ace-Federal Reporters, Inc.
25              MR. BEARD  Okay. Because that is what I wanted
 
                    ~
                                                        , s-
        , $tt -                                              ,      ,
6 Sim : tt-4            I    to say.-    I thought.the pressure on the outlet port is really 2  # sort of immaterial.
3          [    MR. ISLEY: 1Right.
4              MR. BEARD:    Okay.          That is fine. That clears me up.
5            'Wh'en the solenoid is energized, I take it the 6  plunger is sucked upward on the diagram and that causes the 7  bolt, the adjusting bolt they call it, to move downward?
8              MR. ISLEY:    That is correct.
9              MR. BEARD:    Now on the control of the solenoid
!                        10  ~itself,-the' material that I have indicated _that the pressure 11    signal input was from a pressure switch, and that is as 12    far as it went in the description' that I had.
13              MR.-ISLEY:    Right.
r 14              MR. BEARD:  Now recently when.'youlwere up'to visit 15    us in Bethesda last week you gave tus some drawings.
16              MR. iSLEY:    Right.
17                MR. BEARD:    And forgive, I have not had a chance 18    to study them, but I~have one simple question.            Is.that 19  pressure switch really a dual set point bi-stable off.an 20    NNI pressure-instrument channel?
21                MR.-ISLEY:    That is correct.
22                MR. BEARD:  That is all I want to know.
23                MR. BELL:
The NNR or'RPSrpressure?
24                MR. ISLEY:.zThe bi-ptable~itself is NNI.
- Ace-Federal Reporters, Inc.
25                MR. . BELL: But the_ pressure transmitter is-RPS.
om,.                  p y      -    e    a
 
                                                                          +
i
                                                              .                ,                            a 7~        j fg
* Sim t2-5                              MR. ISLEY: . Is RPS through a patch panel going to 3                                                                                ,
                              ~the NNI system.                                                              ,
                                                                                    ~
MR: : BEARD:-      I agree, that is-a cldrification.
3 The last question ~I believe, and this has to do              !
4
                                                          ~
l with the control diagram for the~ electrical switch, and have 5
Y"9        ~ "        ""
6
                                              .MR. ISLEY:          Yes, I think I do.
7 MR. BEARD:          I'only had one minor question on that 8
and then we are done I think.
9 MR. BELL:        This.is a control board hand switch?
10 jj MR. BEARD: 'Yes,'the control board hand switch 12 where y_ou put it in automatic or you manual open and manual 1s. r lock open.
                        '13 34
                                              .( A document.was laid'on the table for the parties to : inspect. ):
15 g                    MR. BEARD:        That is the one.
j7                  MR..ISLEY:        This looks like.the drawing that:I have 18    9
* j9                ' MR. . . BEARD :    Now my question'is'I:do'.not have'a 20  l development diagram for the switch itself. In fact, I am 21 sure if.mine had it on the locked open..
22 Well, let me start here at the top.          Around the l Closed: switch, Contacts 1A and 1B is a Contact 5A and.6A.and 24 I didn't know what these.are_for, and that.is about'it.
  ~ Ace-Federd Reporters, Inc.
                              .Do you know?what those are for?
                        -25
    +9 g-.
4
                                                                  .A..--+-
 
            =                          -                  . -      ,. -              .    .
8 f4                                      '
Sim ke'6-
                            .1              MR.~ISLEY:        No,"I don't.        I would have to look at 2  thejswitch-development itself.-
It is an unusual control 3  switch from what we normally use.                  Th'ere is a 1,ocked open 4  position and an autodatid position - on 'it, and then it is a
;-'                          5  Push to close switch, and I am not su.e what the purpose for 6  that contact, that SA and - 6A Contar.t is.                I would have-to pull 7  that.out.
8              MR. BEARD:        Is that somet.hing'that could be done 9  in~-'like 15 or 30 minutes?
10                MR. ISLEY:        Yes..
11                MR.' BEARD:      Okay.        That is the last' question I l'2  had. Why don't we just leave.that and let you-come back 13  and tell us the answer to that.one question and then I think 14  we are done unless Larry has some questions.
15 4
end Sim              16 Joe fols 17 18 19 20
                        -21 22 23
                        .24 Ace-Federal Reporters, Inc.
                          -25
                                          /
4                                                                            %
g          &      _._y  v                    j  e- _ ( g e      -
me--*
 
    -dO-1-Wal,J.                                                                                  9 1                        MR. BELL:  I have one quick question. On this 4
2          drawing, on the power operator relief valve drawing, it 3          shows two mini switches.
4                        MR. ISLEY:      Yeah.                                4 5                        MR. BELL:  Is that part of the original design 6          on this valve, or was that an add-on after Three Mile Island?
7                        MR. ISLEY:    That was an add-on .
8                        MR. BELL:  And_how recently was.that mini-switch 9          added?
                      '10                        MR. ISLEY:      The drawing was approved in 11          3-9-78. That was before the accident.
12                        MR. BELL:  So it wasn' t an add-on prior to the 13          accident. It was something you decided to do.
14                        MR. ISLEY:    lie had had previous problems 15          with the valve, and that was one of our add-ons to provide 16          additional indication to the operator.
17                        MR. BELL:  Okay.
18                        MR. BEARD:. That is it. Thank you very much.
i 19                        (Whereupon, the meeting concluded at 2:55 p.m. ,
20'          this same day.)
21                                * * **** **
22 23 24 l AmFederal Reporters, Inc.
!                      25 i-l
 
L CERTIFICATE OF OFFICIAL REPORTER This  is to certify that the        attached proceedings before the  UNITED  S7NTES    NUCLEAR    REGULATORY    COMMISSION  in  the matter of:
NAME OF PROCEEDING:        DAVIS BESSE INCIDENT (Interview & Meeting)
(CLOSED)
DOCKET NO.:        --
PLACE:                    OAK HARBOR, OH DATE:                      TUESDAY,-JULY 9, 1985 were held as herein appears, . and that this is the original-transcript thereof for the file of the United States Nuclear Regulatory Commission.
sigt      #
(sigt)M      J/n        .[1.,l M              ,
(Typed)
                                                                    *    ^  "'
* FYjTLEH.WALSH Official Reporter ACE Federal Reporters        Official Reporter Reporter's Affiliation ACE Federal Reporters (sigt)      %                D (Typed)  MARY ffIh0NS Official Reporter ACE Federal Reporter
 
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FIG. I ASSEMBLY OF PRESSURMATIC
!                                  V ALVE STYLE HPV-SN 1
                                .}}

Latest revision as of 08:36, 23 July 2020

Transcript of 850709 Meeting W/Util in Oak Harbor,Oh Re PORV Controls & Instrumentation.Pp 1-9.Supporting Documentation Encl
ML20129B102
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Site: Davis Besse Cleveland Electric icon.png
Issue date: 07/09/1985
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NUDOCS 8507290072
Download: ML20129B102 (12)
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,

fDL O UN11ED STATES NUCLEAR REGULATORY COMMISSION IN THE MATTER OF: DOCKET NO: --- 5 o - 3 %

DAVIS BESSE If1CIDEi1T (IliTERVIEW & f1EETIl1G)

(CLOSED) -

Discuss PORV Controls and Instrumentation.

O .

LOCATION: OAK HARBOR, OH PAGES: 1-9 DATE: July 9, l985 t

l

-O ACE-FEDERAL REPORTERS, INC.

OfficialReporters 444 North Capitol Street 8507290072 850709 Washington, 'D.C. 20001

)

PDR ADOCK 0500 6 (202)347-3700 NATIONWIDE COVERACE

d 1-2 1 UNITED STATES OF AMERICA 2 NUCLEAR REGULATORY COMMISSION 3

4 ---

5 TUESDAY, JULY 9, 1985 6 ---

7 8 MEETING BETWEEN THE NRC FACT-FINDING TEAM AND TOLEDO EDISON 9

TO 10 11 DISCUSS PORV CONTROLS AND INSTRUMENTATION 12 ---

13 NRC FACT-FINDING MEMBERS PRESENT:

14 ERNEST ROSSI J. T. BEARD 15 LARRY BELL 16 TOLEDO EDISCN MEMBERS PRESENT:

17 MR. ISLEY ig MS. MacDONALD 19 ALSO PRESENT:

20 MR. HILBEBRAND, MPR 21 22 23

-24 Ace-Federci Reporters, Inc.

25 ,

3

.Sim 4t-1 W

PROCEEDINGS (2:40 p.m.)

2 MR. BEARD: ' Let's go back on the record.

3 This is another meeting of the fact-finding team

. 4 where-we'would like.to get some more detailed information

.5 on the operation of the pilot operated relief valve.

6 I guess really what we'want to do is just like 7 we have done in the previous meetings today is throw out 8 a couple of points as part of-our understanding and make 9 sure that we understand it accurately. That is all.

-10 MR. ISLEY: All right.: .

11 MR. BEARD: Let me put this figure along with the 12 record, and I will give you a copy of it also. It is the 13 same one that is out of the tech manual that you provided 14 us, with one difference, and that is for some of the balloons 15 around the outside, for example, Item No. 3, I have annotated 16 that like a.t. main' disc. :I put some numbers on it and a 17 couple of things like that, andcI'.have cross-h'atched a couple 18 of the cavities that were mentioned inithe discussion so

~

19 that they are more readily-apparent. That is_all.

. 20 MR..ISLEY: Okay._ Right..

21 MR. BEARD: But there has been no change to the 22 diagram.

23 (The document referred to, ' Fig. 1, 1

24 Assembly of Pressurmatic Valve Ace-Federal Reporters, Inc.

' ~-

25 Style HPV-SN was marked Exhibit l' INDEXL and submitted for the record.)

= .

t __

~

. l 1

Sim 1262 'j MR. BEARD: Now'one of the questions that I had l 2 was in the description.in the tech manual'of the normal 3 condition of'this with the plant at full power and at the

-4 right pressure. So this thing would be closed.

5 MR. ISLEY: . Right.

6 MR. BEARD: They talk about cavities B, C and D 7 being>all at the same pressure.

8 MR. ISLEY: Correct.

9 MR. BEARD: - And ~then they say that because the 10 Pressure at the outlet Port E at the top is low, therefore 11 the valve disc is seated.

12 MR. ISLEY: That is right.

13 (Discussion off the record.)

ja MR.' BEARD: I guess we are back on the record 15 again here.

4

, 16 What I was trying to get at, Tom, is in the tech 17 manual, as I remember it, it talks about since the pressure 18 at B and C~ cavities is high, and that is system pressure.---

19 MR. ISLEY: Right.

20 MR. BEARD: --- and the cavity at the' outlet E is 21 low,-therefore the valve disc is seated and there is no flow.

22 MR. ISLEY: Correct.

23 - MR. BEARD: Now it'seemed to me that a better l -

24 description was that the pressure above and below the valve's

' t Ace-Federal poporters, Inc. . .

25 main disc, in other words,-the pressure.in cavity B is A- , - - - . g - - -

.h y,,

l 5

l

$0-Sim W -3 1 also somewhat above the disc --- J 2 MR. ISLEY: Right.

3 MR. BEARD: --- and cavity C is on the underside, 4 those two pressures really balance the main disc and the 5 spring is what keeps.it closed.

6 MR. ISLEY: Not according to Crosby. Their 7 description of the purpose for Spring C is essentially a 8 shipping holder and just an assist to get the valve closed, 9 and the valve should operate fine with Spring C, or with the 10 spring underneath the disc not even there. If the spring 11 were removed, the valve should work fine.

12 MR. BELL: So it is a differential area that is 13 holding the main disc closed?

14 MR. ISLEY: Yes. I think if you were to look at 15 the surface area available in there and compare the two 16 surface areas, you would see that there is more surface area 17 underneath the disc to campensate for that.

18 MR. BEARD: Okay. So it is the difference not l9 in pressures and really not in E. See, the point I was 20 trying to get at is the pressure in E is not really the 21 driving force for the valve disc as much as it is the 22 pressure on the underside and overside of the main disc.as 23 I thought.

24 MR. ISLEY: Right.

Ace-Federal Reporters, Inc.

25 MR. BEARD Okay. Because that is what I wanted

~

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6 Sim : tt-4 I to say.- I thought.the pressure on the outlet port is really 2 # sort of immaterial.

3 [ MR. ISLEY: 1Right.

4 MR. BEARD: Okay. That is fine. That clears me up.

5 'Wh'en the solenoid is energized, I take it the 6 plunger is sucked upward on the diagram and that causes the 7 bolt, the adjusting bolt they call it, to move downward?

8 MR. ISLEY: That is correct.

9 MR. BEARD: Now on the control of the solenoid

! 10 ~itself,-the' material that I have indicated _that the pressure 11 signal input was from a pressure switch, and that is as 12 far as it went in the description' that I had.

13 MR.-ISLEY: Right.

r 14 MR. BEARD: Now recently when.'youlwere up'to visit 15 us in Bethesda last week you gave tus some drawings.

16 MR. iSLEY: Right.

17 MR. BEARD: And forgive, I have not had a chance 18 to study them, but I~have one simple question. Is.that 19 pressure switch really a dual set point bi-stable off.an 20 NNI pressure-instrument channel?

21 MR.-ISLEY: That is correct.

22 MR. BEARD: That is all I want to know.

23 MR. BELL:

The NNR or'RPSrpressure?

24 MR. ISLEY:.zThe bi-ptable~itself is NNI.

- Ace-Federal Reporters, Inc.

25 MR. . BELL: But the_ pressure transmitter is-RPS.

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  • Sim t2-5 MR. ISLEY: . Is RPS through a patch panel going to 3 ,

~the NNI system. ,

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MR: : BEARD:- I agree, that is-a cldrification.

3 The last question ~I believe, and this has to do  !

4

~

l with the control diagram for the~ electrical switch, and have 5

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6

.MR. ISLEY: Yes, I think I do.

7 MR. BEARD: I'only had one minor question on that 8

and then we are done I think.

9 MR. BELL: This.is a control board hand switch?

10 jj MR. BEARD: 'Yes,'the control board hand switch 12 where y_ou put it in automatic or you manual open and manual 1s. r lock open.

'13 34

.( A document.was laid'on the table for the parties to : inspect. ):

15 g MR. BEARD: That is the one.

j7 MR..ISLEY: This looks like.the drawing that:I have 18 9

  • j9 ' MR. . . BEARD : Now my question'is'I:do'.not have'a 20 l development diagram for the switch itself. In fact, I am 21 sure if.mine had it on the locked open..

22 Well, let me start here at the top. Around the l Closed: switch, Contacts 1A and 1B is a Contact 5A and.6A.and 24 I didn't know what these.are_for, and that.is about'it.

~ Ace-Federd Reporters, Inc.

.Do you know?what those are for?

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.1 MR.~ISLEY: No,"I don't. I would have to look at 2 thejswitch-development itself.-

It is an unusual control 3 switch from what we normally use. Th'ere is a 1,ocked open 4 position and an autodatid position - on 'it, and then it is a

-' 5 Push to close switch, and I am not su.e what the purpose for 6 that contact, that SA and - 6A Contar.t is. I would have-to pull 7 that.out.

8 MR. BEARD: Is that somet.hing'that could be done 9 in~-'like 15 or 30 minutes?

10 MR. ISLEY: Yes..

11 MR.' BEARD: Okay. That is the last' question I l'2 had. Why don't we just leave.that and let you-come back 13 and tell us the answer to that.one question and then I think 14 we are done unless Larry has some questions.

15 4

end Sim 16 Joe fols 17 18 19 20

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.24 Ace-Federal Reporters, Inc.

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-dO-1-Wal,J. 9 1 MR. BELL: I have one quick question. On this 4

2 drawing, on the power operator relief valve drawing, it 3 shows two mini switches.

4 MR. ISLEY: Yeah. 4 5 MR. BELL: Is that part of the original design 6 on this valve, or was that an add-on after Three Mile Island?

7 MR. ISLEY: That was an add-on .

8 MR. BELL: And_how recently was.that mini-switch 9 added?

'10 MR. ISLEY: The drawing was approved in 11 3-9-78. That was before the accident.

12 MR. BELL: So it wasn' t an add-on prior to the 13 accident. It was something you decided to do.

14 MR. ISLEY: lie had had previous problems 15 with the valve, and that was one of our add-ons to provide 16 additional indication to the operator.

17 MR. BELL: Okay.

18 MR. BEARD:. That is it. Thank you very much.

i 19 (Whereupon, the meeting concluded at 2:55 p.m. ,

20' this same day.)

21 * * **** **

22 23 24 l AmFederal Reporters, Inc.

! 25 i-l

L CERTIFICATE OF OFFICIAL REPORTER This is to certify that the attached proceedings before the UNITED S7NTES NUCLEAR REGULATORY COMMISSION in the matter of:

NAME OF PROCEEDING: DAVIS BESSE INCIDENT (Interview & Meeting)

(CLOSED)

DOCKET NO.: --

PLACE: OAK HARBOR, OH DATE: TUESDAY,-JULY 9, 1985 were held as herein appears, . and that this is the original-transcript thereof for the file of the United States Nuclear Regulatory Commission.

sigt #

(sigt)M J/n .[1.,l M ,

(Typed)

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  • FYjTLEH.WALSH Official Reporter ACE Federal Reporters Official Reporter Reporter's Affiliation ACE Federal Reporters (sigt)  % D (Typed) MARY ffIh0NS Official Reporter ACE Federal Reporter

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