ML20083R687: Difference between revisions

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                                                                                                          '7                     h' February 19, 1974                              '-
q Consolidated Edison Company of New York, Inc.
                                                                                                                        !m.y-Re:   Indian Point Unit No. 2 Facility Operating License DPR-26
E ak o 6j d 4 Irving Place, New York, N Y 10003 E-
'                                                              AEC Docket No. 50-247 A.O.-4-2-7 Mr. John F. O' Leary, Director Directorate of Licensing
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,                Office of Regulations U. S. Atomic Energy Commission Washington, D. C.                 20545 4
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!m.y-February 19, 1974 Re:
Indian Point Unit No. 2 Facility Operating License DPR-26 AEC Docket No. 50-247 A.O.-4-2-7 Mr. John F.
O' Leary, Director Directorate of Licensing Office of Regulations U. S. Atomic Energy Commission Washington, D. C.
20545 4


==Dear Mr. O' Leary:==
==Dear Mr. O' Leary:==
 
4 j
j The following report is provided pursuant to the requirements of Section 6.12. 2 (a) of the Technical Specifications to Facility
The following report is provided pursuant to the requirements of Section 6.12. 2 (a) of the Technical Specifications to Facility Operating License No. DPR-26.
!                Operating License No. DPR-26.
1 On February 1, 1974, at approximately 3:50 P.M., both doors of the 80 foot elevation personnel air lock to the contain-ment building were inadvertently open at the same time for a period of about thirty seconds.
1 On February 1, 1974, at approximately 3:50                     P.M., both doors of the 80 foot elevation personnel air lock to the contain-ment building were inadvertently open at the same time for
At time of the occurrence, j
;                        a period of about thirty seconds.                 At time of the occurrence, j
the reactor was shutdown with all full length control rods fully inserted in the core.
the reactor was shutdown with all full length control rods fully inserted in the core.             The reactor coolant system pres-sure and temperature were 2235 psig and 5400 F respectively and the reactor coolant beric acid concentration was approxi-
The reactor coolant system pres-sure and temperature were 2235 psig and 540 F respectively 0
;                        mately 1190 ppm boron. With this concentration of. boron and i
and the reactor coolant beric acid concentration was approxi-mately 1190 ppm boron.
all control rods fully inserted, the reactor was suberitical i                         by more than 7 percent delta k/k.
With this concentration of. boron and i
i i
all control rods fully inserted, the reactor was suberitical i
Our investigation into the cause of the above occurrence re-                                                     j vealed the following pertinent information:
by more than 7 percent delta k/k.
                                                                                                                                        )
i Our investigation into the cause of the above occurrence re-j i
vealed the following pertinent information:
)
Whenever the plant is not in the cold shutdown condition, and containment entry is to be made by other than operating per-sonnel, a man who has been properly instructed on the oper-'
Whenever the plant is not in the cold shutdown condition, and containment entry is to be made by other than operating per-sonnel, a man who has been properly instructed on the oper-'
ation of the air lock doors and the requirements for contain-ment integrity is stationed in the air lock to operate its controls.     In addition, signs are posted at'the outside of each door to inform plant personnel when system conditions i
ation of the air lock doors and the requirements for contain-ment integrity is stationed in the air lock to operate its controls.
are such that containment integrity is required.                         g 8304040610 740219
In addition, signs are posted at'the outside of each door to inform plant personnel when system conditions i
                                                                                                /k\ !
are such that containment integrity is required.
i             PDR ADDCK 05000247
g
* COPY SENT REGION                 ,
/k\\ !
8304040610 740219 i
PDR ADDCK 05000247 COPY SENT REGION


Mr.. John F. O' Leary                                                   February 19, 1974 Re:               Indian Point Unit No. 2                                                         i Facility Operating License DPR                                                                                 AEC Docket No. 50-247 A.O.-4-2-7                                                                         :
Mr.. John F. O' Leary February 19, 1974 Re:
At about 3:50 P.M. on February 1, 1974, an'offsite Company employee in attempting to enter containment from outside the air lock mistakenly operated the wrong hand wheel open-ing the inner lock door.           Both the operator. stationed in-side"the' air ~1ock and the person outside realized what happened and both started to close the inner door. Upon closing, the inner door bounced off its seating frame and the door latch rotated into position with the inner door still open. When the individual outside-the air lock noted the erroneous indication that the inner door was closed, he                                                               R immediately started opening the outer door.                               Before the op-erator inside the air lock could stop its movement, and re--
Indian Point Unit No. 2 i
close the door, containment integrity had been breached for
Facility Operating License DPR AEC Docket No. 50-247 A.O.-4-2-7 At about 3:50 P.M. on February 1, 1974, an'offsite Company employee in attempting to enter containment from outside the air lock mistakenly operated the wrong hand wheel open-ing the inner lock door.
* about thirty seconds.
Both the operator. stationed in-side"the' air ~1ock and the person outside realized what happened and both started to close the inner door.
3              The measures previously taken to minimize the chance of malfunc-tion of the door interlock will continue to be followed (refer to my letter to you of September 27, 1973). In addition, we are
Upon closing, the inner door bounced off its seating frame and the door latch rotated into position with the inner door still open.
;              working with Wedco and the manufacturer of the air lock.to deter-
When the individual outside-the air lock noted the erroneous indication that the inner door was closed, he R
;              mine the cause of the interlock malfunction and necessary correc-                                                                   3             ,
immediately started opening the outer door.
tive action.                                                                                                                                       i As previously indicated, at the time of the occurrence, the re-                                                                                   '
Before the op-erator inside the air lock could stop its movement, and re--
actor was in a shutdown condition. While in the shutdown' condition, the consequences of major accidents are significantly reduced.- This fact combined with the shortness of the duration of the lack of con-tainment integrity minimize the safety implications to this occur--
close the door, containment integrity had been breached for about thirty seconds.
The measures previously taken to minimize the chance of malfunc-3 tion of the door interlock will continue to be followed (refer to my letter to you of September 27, 1973).
In addition, we are working with Wedco and the manufacturer of the air lock.to deter-mine the cause of the interlock malfunction and necessary correc-3 tive action.
i As previously indicated, at the time of the occurrence, the re-actor was in a shutdown condition.
While in the shutdown' condition, the consequences of major accidents are significantly reduced.- This fact combined with the shortness of the duration of the lack of con-tainment integrity minimize the safety implications to this occur--
rence.
rence.
J Very truly yours,
J Very truly yours,
                                                                                                                                                                  't
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_                                                  W                               '      .
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)                                                                             Warren.R. Cobean,                 Jr.~,     Ma           ger l                                                                             Nuclear' Power Generation                                   ',                .c i                                                                                                         ,                                ,-
Warren.R. Cobean, Jr.~,
* cc:                   Mr. James P. O'Reilly.
Ma ger l
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Nuclear' Power Generation
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Mr. James P. O'Reilly.
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Latest revision as of 05:06, 14 December 2024

AO 4-2-7:on 740201,both Doors of Personnel Air Lock to Containment Bldg Opened at Same Time.Caused by Erroneous Operation of Hand Wheel Door Lock by Offsite Employee Which Triggered Failure of Interlock.Interlock Inspected
ML20083R687
Person / Time
Site: Indian Point Entergy icon.png
Issue date: 02/19/1974
From: Cobean W
CONSOLIDATED EDISON CO. OF NEW YORK, INC.
To: Oleary J
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20083R695 List:
References
AO-4-2-7, NUDOCS 8304040610
Download: ML20083R687 (2)
v • d • e


Text

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Om r'as -

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q Consolidated Edison Company of New York, Inc.

E ak o 6j d 4 Irving Place, New York, N Y 10003 E-

u. 4, 4 e.m

.F i I

,[

'7 h'

!m.y-February 19, 1974 Re:

Indian Point Unit No. 2 Facility Operating License DPR-26 AEC Docket No. 50-247 A.O.-4-2-7 Mr. John F.

O' Leary, Director Directorate of Licensing Office of Regulations U. S. Atomic Energy Commission Washington, D. C.

20545 4

Dear Mr. O' Leary:

4 j

The following report is provided pursuant to the requirements of Section 6.12. 2 (a) of the Technical Specifications to Facility Operating License No. DPR-26.

1 On February 1, 1974, at approximately 3:50 P.M., both doors of the 80 foot elevation personnel air lock to the contain-ment building were inadvertently open at the same time for a period of about thirty seconds.

At time of the occurrence, j

the reactor was shutdown with all full length control rods fully inserted in the core.

The reactor coolant system pres-sure and temperature were 2235 psig and 540 F respectively 0

and the reactor coolant beric acid concentration was approxi-mately 1190 ppm boron.

With this concentration of. boron and i

all control rods fully inserted, the reactor was suberitical i

by more than 7 percent delta k/k.

i Our investigation into the cause of the above occurrence re-j i

vealed the following pertinent information:

)

Whenever the plant is not in the cold shutdown condition, and containment entry is to be made by other than operating per-sonnel, a man who has been properly instructed on the oper-'

ation of the air lock doors and the requirements for contain-ment integrity is stationed in the air lock to operate its controls.

In addition, signs are posted at'the outside of each door to inform plant personnel when system conditions i

are such that containment integrity is required.

g

/k\\ !

8304040610 740219 i

PDR ADDCK 05000247 COPY SENT REGION

Mr.. John F. O' Leary February 19, 1974 Re:

Indian Point Unit No. 2 i

Facility Operating License DPR AEC Docket No. 50-247 A.O.-4-2-7 At about 3:50 P.M. on February 1, 1974, an'offsite Company employee in attempting to enter containment from outside the air lock mistakenly operated the wrong hand wheel open-ing the inner lock door.

Both the operator. stationed in-side"the' air ~1ock and the person outside realized what happened and both started to close the inner door.

Upon closing, the inner door bounced off its seating frame and the door latch rotated into position with the inner door still open.

When the individual outside-the air lock noted the erroneous indication that the inner door was closed, he R

immediately started opening the outer door.

Before the op-erator inside the air lock could stop its movement, and re--

close the door, containment integrity had been breached for about thirty seconds.

The measures previously taken to minimize the chance of malfunc-3 tion of the door interlock will continue to be followed (refer to my letter to you of September 27, 1973).

In addition, we are working with Wedco and the manufacturer of the air lock.to deter-mine the cause of the interlock malfunction and necessary correc-3 tive action.

i As previously indicated, at the time of the occurrence, the re-actor was in a shutdown condition.

While in the shutdown' condition, the consequences of major accidents are significantly reduced.- This fact combined with the shortness of the duration of the lack of con-tainment integrity minimize the safety implications to this occur--

rence.

J Very truly yours,

't W

)

Warren.R. Cobean, Jr.~,

Ma ger l

Nuclear' Power Generation

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cc:

Mr. James P. O'Reilly.

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