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1 MSP NORTHERN                 STATES             POWER       COMPANY w ou N z Apou s, uiN w e sOTA 55401                                 /h, March 5, 1970                                       prpf     g 6
1 MSP NORTHERN STATES POWER COMPANY
RwL{&g       ,
/h, w ou N z Apou s, uiN w e sOTA 55401 March 5, 1970 prpf g
MAR 91970*- ;2 Dr. Peter A. Morris, Director g7 Division of Reactor Licensing                                                           a,t nag United States Atomic Energy Commission                                                     8Murma Washington, D.C. 20545                                                             k       Mg
RwL{&g 6
g7 MAR 91970*- ;2 Dr. Peter A. Morris, Director Division of Reactor Licensing a,t nag United States Atomic Energy Commission 8Murma Washington, D.C.
20545 k
Mg


==Dear Dr. Morris:==
==Dear Dr. Morris:==
O         "
O m
m MONTICELLO NUCLEAR GENERATING PLANT E-5979 Docket No. 50-263         Regulator"     File Cy.
MONTICELLO NUCLEAR GENERATING PLANT E-5979 Docket No. 50-263 Regulator" File Cy.
The ACRS, as set forth in its report letter of Janua$y 10, 1970, has determined that a limited program of vibration monitoring is appropriate for the Monticello                         j reactor during preoperational tests and initial operation. We met with members of your staff on February 25 and described the vibration monitoring program that will be undertaken in response to the ACRS request. Subsequently we were in-formed that the proposed program is acceptable to the DRL staff.
The ACRS, as set forth in its report letter of Janua$y 10, 1970, has determined that a limited program of vibration monitoring is appropriate for the Monticello j
reactor during preoperational tests and initial operation. We met with members of your staff on February 25 and described the vibration monitoring program that will be undertaken in response to the ACRS request. Subsequently we were in-formed that the proposed program is acceptable to the DRL staff.
The vibration monitoring program for the Monticello reactor will utilize eight displacement sensors located in two areas of the reactor internals as,1) shroud flange, and 2) jet pump assembly. The primary intent is to measure, both hot and cold, the most important vibration characteristics.
The vibration monitoring program for the Monticello reactor will utilize eight displacement sensors located in two areas of the reactor internals as,1) shroud flange, and 2) jet pump assembly. The primary intent is to measure, both hot and cold, the most important vibration characteristics.
The specific locations of the sensor instruments are as follows:
The specific locations of the sensor instruments are as follows:
l
: 1) Four (4) displacement sensors located at 90* positions near the shroud flange and measuring relative motion between the shroud and the pressure i
: 1) Four (4) displacement sensors located at 90* positions near the shroud flange and measuring relative motion between the shroud and the pressure                     i vessel tmder hot and cold conditions.                                                         I i
vessel tmder hot and cold conditions.
i
: 2) Two (2) displacement sensors located at two individual jet pump risers and indicating tangential motion of the risers with response to the pres-sure vessel, measured under hot and cold conditions.
: 2) Two (2) displacement sensors located at two individual jet pump risers and indicating tangential motion of the risers with response to the pres-sure vessel, measured under hot and cold conditions.
: 3) Two (2) displacement sensors on a single jet pump assembly, located on each of the two jet pump throat areas and measuring the relative radial                         l motion between the jet pump throats and pressure vessel, under hot and cold conditions.                                                                             ,
: 3) Two (2) displacement sensors on a single jet pump assembly, located on each of the two jet pump throat areas and measuring the relative radial motion between the jet pump throats and pressure vessel, under hot and cold conditions.
l Installation work is proceeding for the equipment required under this program so that vibration monitoring data collection can begin during the preoperational test period.
Installation work is proceeding for the equipment required under this program so that vibration monitoring data collection can begin during the preoperational test period.
Yours very       v, MID/ ~f
Yours very v,
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MID/
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l C             9 g']OYi                   D. F. McElroy                                       [
C 9 g']OYi D. F. McElroy i p y
i p                 y     Vice President - Engineering                                 '
Vice President - Engineering
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Latest revision as of 13:47, 17 December 2024

Advises of Specific Locations of Sensor Instruments Re ACRS Rept Setting Forth Limited Program of Vibration Monitoring for Plant
ML20056B706
Person / Time
Site: Monticello 
Issue date: 03/05/1970
From: Mcelroy D
NORTHERN STATES POWER CO.
To: Morris P
US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 9102080392
Download: ML20056B706 (1)
v • d • e


Text

,..

1 MSP NORTHERN STATES POWER COMPANY

/h, w ou N z Apou s, uiN w e sOTA 55401 March 5, 1970 prpf g

RwL{&g 6

g7 MAR 91970*- ;2 Dr. Peter A. Morris, Director Division of Reactor Licensing a,t nag United States Atomic Energy Commission 8Murma Washington, D.C.

20545 k

Mg

Dear Dr. Morris:

O m

MONTICELLO NUCLEAR GENERATING PLANT E-5979 Docket No. 50-263 Regulator" File Cy.

The ACRS, as set forth in its report letter of Janua$y 10, 1970, has determined that a limited program of vibration monitoring is appropriate for the Monticello j

reactor during preoperational tests and initial operation. We met with members of your staff on February 25 and described the vibration monitoring program that will be undertaken in response to the ACRS request. Subsequently we were in-formed that the proposed program is acceptable to the DRL staff.

The vibration monitoring program for the Monticello reactor will utilize eight displacement sensors located in two areas of the reactor internals as,1) shroud flange, and 2) jet pump assembly. The primary intent is to measure, both hot and cold, the most important vibration characteristics.

The specific locations of the sensor instruments are as follows:

1) Four (4) displacement sensors located at 90* positions near the shroud flange and measuring relative motion between the shroud and the pressure i

vessel tmder hot and cold conditions.

i

2) Two (2) displacement sensors located at two individual jet pump risers and indicating tangential motion of the risers with response to the pres-sure vessel, measured under hot and cold conditions.
3) Two (2) displacement sensors on a single jet pump assembly, located on each of the two jet pump throat areas and measuring the relative radial motion between the jet pump throats and pressure vessel, under hot and cold conditions.

Installation work is proceeding for the equipment required under this program so that vibration monitoring data collection can begin during the preoperational test period.

Yours very v,

MID/

(~N

~f 'k Qf

^

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"^

C 9 g']OYi D. F. McElroy i p y

Vice President - Engineering

  • if DFM/ECW/1j

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.f 719 /

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9102000392 700305 CF ADOCK 05000263:

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