ML20081E739

Rev 6 to 25-2F, Operator Training Student Study Matl. Related Matl Encl

ML20081E739
Person / Time
Site:	Brunswick
Issue date:	04/20/1990
From:	CAROLINA POWER & LIGHT CO.
To:
Shared Package
ML20081E572	List: ML20081E739
References
FOIA-94-179 25-2F, NUDOCS 9503210417
Download: ML20081E739 (63)

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TRAVERSING INCORE PROBE INSTRUMENTATION 25-2F r

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Manager - Training /i i

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SML 252F 1

Rev. 6

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CONTENTS P.AER l

List of Figures iv l

v i

Objectives t

INTRODUCTION 1

i 1

System Purpose r

1 l

Design Basis SYSTEN DESCRIPTION 1

t General Description 1

l 2

-Major Components Traversing In-Core Probe System Components 2

INSTRUMENTATION AND CONTROL 10 f

Traversing In-Core Probe System 10 l

i Flux Probing Monitor 10 l

Valve Control Monitor 12

[

Drive Control Unit 13 i

X-Y Recorder 17 Process Computer 18 PLANT INTrnart1TIONSEIPS 19 F

Traversing In-Core Probe System 19 i

Normal Operational Relationships 19

[

Abnormal Operational Relationships 21 Relationships with Other Systems 22 SYSTEN PROCEDURES 24 OP-09.1 TIP Operating Procedure 24 AOP-05.1 Hi Radiation in Occupied Area 24

)

r SML 252F 2

Rev. 6 i

i

LIST OF FIGURES Fiaure 1

TIP Block Diagram 2

TIP Drive Mechanism 3

TIP Drive Control Unit l

4 Gleason Take Up Real Assembly 5

TIP Shield Chamber 6

TIP Ball Valve j

7 TIP Shear Valve 8

TIP Indexing Mechanism 9

TIP Purge System 10 TIP Four-Way Connector i

11 TIP Flux Probing Monitor l

12 TIP Valve Control Monitor 13 TIP X-Y Recorder i

l 9

SML 252F 3

Rev. 6 4,.___

OBJECTIVES Upon completion of this study material, the student should be able to:

State the purpose of the Traversing In-core Probe (TIP) 1.

system.

State the purpose for the following TIP system components:

2.

Drive mechanism a.

b.

TIP drive control unit Gleason take up reel assembly c.

d.

Shield chamber e.

Ball valve f.

Shear valve g.

Indexing mechanism h.

Four-way connector 1.

Flux probing monitor j.

Valve control monitor k.

X-Y recorder State the power supplies to the TIP system.

3.

f State the effect that a loss or malfunction of the TIP 4.

system will have on the following:

a.

LPRMs b.

TIP dry tubes Explain how the following will affect.the TIP system:

5.

a.

Low water level Hi drywell pressure b.

Failure of the Drywell to isolate on a valid signal c.

d.

Shear valve firing while the TIP is inserted List the systems that receive TIP output signal.

6.

Given plant conditions and Technical Specifications, 7.

determine if all TIP related LCOs are met.

State the bases for the following Technical Specifications:

8.

a.

3.3.2 (TIP related only) b.

3.6.3 (TIP related only)

SML Rev. 6 4

252F

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I i

6' i

f I.

INTRODUCTION A. -

System Purpose The Traversing In-Core Probe'(TIP) System provides a f

means of measuring axial thermal neutron. flux'over 31 j

~

fixed channels in the reactor core and translating the measurements of the selected channel.into graphs of thermal neutron flux versus detector axial position in 3

i These measurements are a'lso used to the core.

I calibrate the Local Power Range Monitoring System (LPRM) detectors which are fixed in-core.

B.

Damien Basis The TIP system is designed to measure and record the axial neutron flux profile at 31 radial positions and The for use in calibration of the LPRM detectors.

i system is also designed such that the TIP dry tubes can be quickly isolated in the event of RCS leaks into the-dry tubes to prevent leakage into the drive mechanism.

II.

SYSTEM DESCRIPTION A,

General Descrintion I

1.

Traversina In-Core Probe The TIP system consists of four identical traversing in-core probes (TIPS) which are inserted by motor drives into the core to allow the mapping of the axial neutron flux profile at 31 radial locations (same location as LPRM strings) and the calibration of LPRM detectors.

• SML Rev. 6 5

252F l

J L a.

l i

l The TIP system is made up of four TIPS, their drive systems including cables and motor drives, i

associated electronics, and mechanical devices for i

i TIP insertion, operation and system. isolation.

l

~

The following TIP system components.will be h

discussed in detail in subsequent sections.

i a.

Detector b.

Detector drive cable / signal lead c.

Drive mechanism j

d.

Gleason real assembly e.

Shield chamber i

f.

Shear valve i

g.

Ball valve h.

Index mechanism 1.

Purge system j.

Four-way connectors k.

Guide tubes B.

Maior connenents l

1.

Traversina In-core Probe System Connonents TIP system component

• discussed,below are illustrated in part by a block diagram in Figure 1.

a.

Detector - designed to traverse the entire j

t length of the core through a dry tube in the i

LPRM detector tube.

There are four identical 2

miniature fission chambers similar to the SKL l

252F 6

Rev. 6 i

i

9 The LPRM detectors constructed of titanium.

detector is coated internally with highly enriched uranium, 90% U (U

content:

0.6 milligrams) and uses Forsterite,.a

~

refractory material, as an insulator.

l t

The chamber is filled with argon gas under a pressure of 91.5 centimeters of mercury and has an operating _ voltage of 100-200 VDC.

The active portion of the detector is about 0.2 inches in outside diameter by 1 inch long and j

-18 f

has a neutron sensitivity of 8.17 x 10 amps /NV + 20% and maximum gamma sensitivity

-18 of 3 x 10 amps /R/h.

Based on the chamber's design sensitivity, the detector has a neutron flux operating range of 2.8 x 2

14 10 NV to 2.8 x 10 NV maximum,

)

i l

Detector Drive Cable / Signal Lead The detector b.

drive cable is a.O.25 inch outside diameter 150 feet long coaxial signal cable with stainless steel conductor and magnesia The entire length is protected by insulator.

a carbon steel helical wrap, which is dry lubricated with molybdenum disulfits to provide a low friction means of driving the SML Rev. 6 7

252F 1

~

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detector.

The detector drive cable is designed for an operating environment of less i

than 50% relative humidity and ambient temperature of 290*F (maximum temperature of l

608'F) and has a design exposure life of 10

[

19 t

NV-sec.

t c.

Drive Mechanism (Figure 2) i The purpose of the drive mechanism is to-l provide forward or reverse and high or low-speed detector cable drive on. commands from'the drive control unit (Figure 3).

It consists basically of an air tight metal enclosure housing a 1/2 horsepower Eaton drive motor and a Gleason cable real assembly.

Two speeds (forward and reverse) of 7.5 feet per minute (7.5 fpm) and 60 feet per minute (60 fpa) pre provided by the motor drive.

l The motor is equipped with a fail-safe l

friction brake to prevent inertial overshoot.

Detector position indication and signals are f

provided by a "Veeder-Raot" counter which displays a digital readout of detector SML 252F 8

Rev. 6 v

w

'i position on the drive control unit and by a potentiometer.which supplies a dc a

ado-turn

. voltage analog signal-of detector position to the plant process computer'and the TIP X-Y recorder.

Both the counter and potentiometer I

are eprocket coupled to the shaft.of friction slip clutch'of the drive mechanism to enable the measurement.of detector positions.

d.

Gleason Real Assembly ~(Figure 4)

The assembly is a takeup real of 20 inches in diameter which stores the detector drive cable.

A tie plate is mounted on the takaup real to serve as a signal connector between the drive cable and smooth (unwrapped).

triaxial signal cable.

Two smaller drums store the smooth signal lead.

Shield Chamber (Figure 5) e.

The purpose of the shield chamber is.to provide personnel shielding from a recently withdrawn detector since the detector would be highly radioactive.

The TIP guide tube passes through the radial center of the shield chamber which is a small SML Rev. 6 9

252F

~

e cask, 14 inches in diameter by 20 inches.

filled with lead shot.

A limit switch located in the longitudinal

~

center of the chamber is actuated by the r

detector or drive cable to terminate detector withdrawal and to ensure the detector is withdrawn to its In-Shield position.

The i

In-Shield light on the drive control unit is also activated by the limit switch to indicate that the detector is in the shield chamber.

This limit switch has been known to fail 3

causing the detector to travel beyond the "In-Shield" position.

If you observe a 1

difference in the known "In-Shield" digital position and the "In-Shield" light on the i

drive control unit, it could be indicating a l

limit switch problem.

Be aware of potential i

radiation hazards.

I h

i f.

Ball Valva (Figure 6)

{

A solenoid-operated valve that is installed in the detector guide tube between the drive i

mechanism and the indexing mechanism to provide a normal means of sealing the guide SML 252F 10 Rev. 6 I

I tube and to prevent leakage of contaminated coolant from the reactor vessel into the j

i drive mechanism.if a leak develops in the guide tube in the reactor.

i

)

The valve is normally closed and is. opened only when the TIP is traversed in or out of.

i The valve is opened automatically

.the core.

by the limit switch in the shield chamber (described in previous section) when the detector is moved forward and the drive motor is energized.

Shear Valve (Figure 7) g.

The purpose of the shear valve is to provide an emergency means of sealing a guide tube if the TIP dry tube (in-core) should leak or the TIP detector cannot be retracted; thereby It is a preventing ball valve closure.

wedge-shaped guillotine to ensure the

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complete seal of the guide tube even'with the

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detector cable inside.

The shear valve is'an explosive valve with a squib detonation circuit consisting of two SML Rev. 6 11 252F

-wm m

wn e-

-..w-w w

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primers, two firing circuits, and one indication circuit.

The indication circuit is continuously monitored and will be broken

'if squib is. detonated.

The shear valve is controlled by a key-lock switch on the valva control monitor drawer.

The Fire position applies greater than 4 amps to the squib to cause detonation.

Instrumentation'and controls for the TIP system will be discussed later in detail.

h.

Index Mechanism (Figure 8)

The purpose of the index mechanism is to.

provide precise coupling between a fixed guide tube and any one of ten removable guide tubes that lead to in-core positions and i

enable the path for the detectors to the various in-core positions.

The fixed guide i

tubes provide the link between the-indexer and the drive mechanisms, and the stationary guide tubes provide the paths from the indexer to the core.

I SML Rev. 6 12 252F

d

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J The index mechanism consists of, t

. mechanically, a Geneva gear and a drive motor 1

and limit and position switches necessary for control circuits.

Control of the indexer is by a channel selector switch.

i 1.

Purge System (Figure 9) 1 The purpose of the purge system is to t

maintain the relative humidity in the guide i

tubes at a constant value over the length of j

detector travel and maintain a dry atmosphere i

f in the drive mechanism and indexer enclosures to eliminate corrosion of the helical wrap.

(carbon steel), which reduces the chance of-l insulation breakdown and signal loss.

The purge system is divided into two subsystems:

Drive Mechanism Purge System and Indexar Purge System.

(1)

Drive Mechanism Purge System - Dry air is used to pressurize the airtight drive mechanism enclosure.

Flow is controlled to each drive mechanism at 3.0 standard cubic feet per hour.

Before opening the drive mechanism enclosure, secure the purge system to SML 252F 13 Rev. 6

prevent possibility of radioactive contamination spread from activated corrosion products.

(2)

Indexar Purge System Dry nitrogen is supplied from the cAc system to each airtight indexer enclosure via an internal pressure control valve which maintains a pressure of 7 inches of water above drywell

' ontainment pressure.

An internal c

blowout valve opens to provide overpressurization protection if the indexar pressure exceeds 5 psig above the containment pressure.

The system is designed for a maximum flow rate of 140 standard cubic feet per day.

When installing or reinstalling removable guide tubes, the Indexer Purge system is activated and the guide tube to dry tube penetration is slightly opened to purge and fill guide tubes.

This operation is controlled by a purge switch on the valve control monitor.

(See OP-09.1 for specific instructions.)

SML 252F 14 Rev. 6

' e'.

j.

Four-Way. Connectors (Figure 10) i The purpose of: the connectors is to provide a

+

common path for the four indexers to the common channel (10) at core position 28-29.

I Guide tubes from TIP indexers A, B, C, and D i

meet at the four-way connector.

on the other side of the connector, one guide tube leads to core position 28-29 (Channel 10).

Figure 14 gives the core location of all LPRMs and the respective TIP machines.

i k.

Guide Tubes

?

Guide tubes are part of the LPRM detector assembly.

The inner surface of the guide tubing between the reactor vessel and the

'l drive mechanica is coated with a lubricant to reduce friction.

The inner surface of the guide tube portion within the reactor vessel i

is nitridad.

J III.

INSTRUMENTATION AND CONTROL A.

Traversina In-core Probe System The TIP system instrumentation and controls consist of five major components:

1) flux probing monitor, 2) valve control monitor (3 total), 3) drive control unit (4 total), 4) X-Y recorder, and 5) plant process computer.

SHL Rev. 6 15 252F 1

i

j TIP Flur Probina Monitor (Figure _11) 1.

l The flux probing monitor provides control and j

indications for:

l l

The two low voltage power supplies going to a.

+

the flux amplifiers; A calibration card used for calibration of b.

the flux amplifiers; and Four high voltage power supplies and flux j

c.

amplifiers (one per TIP detector).

The monitor also provides selection of flux amplifier output to the X-Y recorder and the process computer.

Controls and indications l

I for the flux probing monitor are as follows:

f 1

Device PositiQD, Punction 1)

Switch S-1 A Bus -

Connects meter M-1 to

-10V DC output of low (Meter voltage power supply PS7 selector switch) r A Bus +

Connects meter M-1 to j

+10V DC output of power supply 7

i 16 l

SML Rev. 6 252F t

i i

-= -.

l

\\

Connects meter M-1 to 5 Bus-

-10V DC output of. power supply Connects meter M-1 to B Bus +

+10V DC output of power supply t

CH1-CH4 Indicates. power supply I

r voltage when S-1 is in

~

any of the " Bus" positions.

(During calibration indicates flux amplifier output l

r l

when S-1 is in channel A-thru channel D)

Channel 1 Connects meter M-1 to l

2)

Switch S-2 (Channel through (refers to calibrate subsystem) i output-of flux selector I

switch)

Channel 4 Ampilfier for the l

f selected. (Used during i

TIP calibration) 3)

Meter M-1 0 - 125 Indicates percent power j

when S-1 is at channel 1 (Upper scale) through channel 4 position

)

Rev. 6 l

SML 17 252F

,---n

i 0-10

. Indicates power supply l

(lower' voltage when S-1 is in scale) any " Bus" positions.

(During calibration indicates flux amplifier

~

output when S-1 is in channel 1 thru channel 4) 2.

Valve control Monitor (Figure 12)'

The valve control monitor houses control and indication circuits for the-shear valve, ball j

valve and nitrogen purge system.

There are two drawers; each drawer has controls for two TIP subsystems.

Controls and indications for the valve control monitor are as follows:

i Valve Control and Indication Device Position Function 1)

Key lock Monitor Key switch switch S-1 is open j

Fire Detonates expiosive shear l

valve 2)

Key lock Monitor Key switch is i

open switch S-2 i

(Same as Fire Detonates SI) explosive shear valve SML j

252F 18 Rev. 6

5 l

i 3)

Purge switch On Activates purge system S-3 Off Deactivates l

1 purge system 4) squib Monitor On Indicates'

'.l the circuit (amber) lights has l

been fired or I

is open f

5)

Shear valve on Indicates shear valve monitor (amber)

Jights has been detonated 1

i 6)

Ball valve On Indicates ball i

1 red valve is open r

light open 7)

Ball valve On Indicates ball l

closed (green) valve is light closed 8)

Time delay On Indicates ball l

light (white) valve is open j

and interlock j

i circuit is

[

l complete I

SML 19 Rev. 6 t

252F

'm I

9)

Purge light On Indicates purge system is (red) i activated i

Indicates that 10)

F 5 light On

~

the Group II (Cont isol) containment isolation bus l

fuse is not blown Drive control Unit (Figure 3) 3.

i The purpose of the drive control unit is to align l

and control detector motion; and to examine switch automatic functions and predetermined positions, core dimension limits to logically issue drive t

signals which will not damage the detector or drive cable.

There are 4 total, one per TIP detector subsystem.

The drive control unit allows either the automatic i

mode or manual mode of operation.

The automatic mode drives the ostector from the shield chamber to the selected in-core position and plots the l

neutron flux profile as the detector is withdrawn i

automatically.

i i

SML Rev. 6 i

20 252F f

a The manual mode is an alternative to automatic i

l scanning of the core and provides incremental positioning of the detector at the selected i

in-core position.

t There are 31 core positions which can be flux-mapped axially with the four detectors and

[

i Each the proper selection of detector channels.

f core position corresponds to a unique combination f

i of TIP detector (A, B, C or D) and detector i

channel.

OP-09.1 provides information on the core i

positions and the required TIP detectorchannel o

combinations.

f Controls and indications on the drive control unit are as follows:

Drive control Unit Device Position Function j

l i

1)

Channel 1 thru 10 Selects in-core position (TIP dry select tube - LPRM (switch string) to which the S-1) indexar must align the detector SML Rev. 6 21 252F

i 2)

Auto start Pressed Provides automatic

.i (pushbutton, detector drive when S-2) mode switch S-7 isset to Auto and

~

manual switch S-3 is I

set to Off l

3)

Manual Off Enables the Auto 1

(switch, position of Mode i

S-3)

Switch S-7

[

FWD Drives detector to t

top of core.

l Overrides Auto i

position of Mode Switch S-7.

REV Drives detector from f

core top to shield.

I Overrides Auto position of mode switch S-7 4)

Scan Off Pen lifts and (switch, follows detector S-4) operation.

I i

only records when i

with drawing from Core l

l SML 252F

_2 Rev. 6 I

i

l j

~

e Disables pen lift On circuit and causes l

continuous operation f

of recorder t

5)

Low speed Off Makes low-speed drive a function of (switch S-5) detector position and independent of i

operator control Initiates continuous On low-speed detector drive 6)

Core limit Top Permits digital display of selected

)

(switch, s

channel S-6) 1 preprogrammed j

i top-core 1

limit which

.l corresponds to top of active fuel Bottom As above, except preprogrammed core bottom limit is displayed.

(The core top and bottom numbers are SML Rev. 6 23 252F

a l

I different for each-TIP channel because i

of different lengths of guide tube run) 7)-

Mode Off Deanergizes power t

(switch, supplies in drive j

control unit j

(s-7)

Manual Positions detector in conjunction with j

l the FWD and REV position of manual

' switch s-3 i

i Auto Permits automatic

{

mode of operation when Auto start S-2 f

is pressed j

8)

Manual Valve Closed Permits ball valve l

(Switch, S-9) to open Control i

i automatically when drive mechanism is operated Open opens ball valve without energizing 5

the drive motor in i

the drive mechanism i

1 j

SML 252F 24 Rev. 6 l

l t

i 9)

Detector Illuminated Continuous digital l

display position of digits I

detector position.

l t

("0000" - reference

\\

point about one foot I

behind the indexer; l

^

"9800" "In-Shield" j

position) 10)

Core Illuminated Static digital i

display of Limit

~

j digits i

preprogrammed core-top or bottom limits of selected j

channel i

11)

Ready Lighted Indicates that l

indexer is properly l

(light) aligned to selected channel 12)

Core Top Lighted Detector is at (light) top of core

[

i 13)

In-Core Lighted Detector is above core-bottom (light) limit j

i 14)

In-shield Lighted Detector is in i

shield (light) chamber SML Rev. 6 25 252F I

i

\\

l i

1 Axial flux profile j

Lighted i

15)

Scan is being recorded j

(light)~

l 16)

Low speed Lighted Detector is being l

l at low-speed (7.5 i

(light) feet / min) 17)

Rev (reverse)

Lighted Detector moving away l

i from top of core (light) 18)

FWD (forward)

Lighted Detector moving l

f toward top of core (light) i Lighted dimly Ball valve is open l

l 19)

Valve i.

(light)

Ball valve is closed

-l Lighted brightly i

Y-Y Recorder (Figure 13) j 4.

1.j Provides a graph of neutron flux versus detector t

position.

]

The recorder operates either automatically or In the manually during the core traversing cycle.

Automatic mode, the recorder operates i

l automatically when detector withdrawal begins fron l

To set the recorder for the top of the core.

automatic operation:

put the mode switch (drive f

control unit S-7) at Auto and the scan switch at l

?

(flux Off; using channel selector switch 5-2 I

Rev. 6 SML 26 252F I

f

l 4

1 probing monitor), select the desired detector (channel), and push the Auto Start (S-2) t pushbutton on the drive control unit.

The j

recorder also operates any time the scan switch is

~

at On and the detector is between core-bottom and core-top limits regardless of mode switch position (Auto or Manual),

t Controls on the X-Y recorder drawer are.as l

follows:

i Device Position Function 1)

Power On Power applied (switch) to recorder i

servos.

Power to servos Off off 2)

Power Lighted (red)

Same as On (light) 3)

Pen Down Places pen (switch) on paper 4)

Chart Hold Electrostatic (switch) charge holds i

I paper on recorder SML 252F 27 Rev. 6

t Release Charge is dissipated 5)

All other controls to be adjusted by qualified f

instrument personnel only.

5.

Process ConDuter Performs calculation of gain adjustment factors (GAFs) for the calibration of LPRMs, and records and prints out flux measurement data.

Also calculates substitute data for out-of-service LPRM.

i Inputs to the Computer from the TIP system consist Of i

a.

Detector position signal from drive control unit.

i b.

Neutron flux level signal from flux probing monitor.

c.

Channel selected from indexer switch S-1 through drive control unit.

The computer then stores the data and types out data for each TIP trace (scan) run including:

which TIP machine and channel was used, the core coordinates of the selected channel, and neutron flux levels at 24 nodes over the in-core length of i

detector travel.

a 4

SML 252F 28 Rev. 6 i

r

l l

IV.

PLANT INTea m ATIONSEIPS

[

Treversina In-core Probe System i

A.

Normal Onerational Relationshins Normal operation i

1.

can be automatic or manual.

Consult OP-09.1 for f

i precautions, initial conditions, and specific instructions.

I Automatic operation Sequence (In general, the a.

following is the sequence for automatic j

operation; but be.sure to use OP-09.1)

(1)

Select desired channel on flux probing

.f I

monitor, in order to:

(a)

Sands selected TIP signals to X-Y l

recorder.

(b)

Selects the TIP detector to be run l

.1 (2)

Put mode switch (drive control unit) in

. Auto.

(3)

Put manual switch (drive control unit) in Off.

I (4)

Put low-speed switch (drive control unit) in Off.

(5)

Select channel (1 to 10) on drive i

control unit corresponds to desired core location.

(6)

Ready light lighted (indicate indexar has aligned the path for detector to the desired core position).

SML Rev. 6 29 252F I

~.

(7)

Press auto start pushbutton (drive l

control unit).

I (8)

Detector will automatically move from shield chamber through indexer at low i

speed (7.5 feet / minute)

(9)

Past indexar (reference point of 0000)

+

speed switches automatically to fast (60-I feet / minute) j (10) At core bottom limit speed changes back j

i to slow.

(11) At core top limit detector stops and f

reverses direction.

(12) X-Y recorder pen drops automatically to.

paper.

(13) Scan light lighted.

)

(14) At core bottom limit the speed increase to fast.

l (15) Detector stops at 0000 reference - about 1 foot behind indexer (toward shield).

l (16) New channe?. may be selected and process

{

repeated.

I b.

Manual Operation Sequence (Consult OP-09.1 for specific instructions).

Manual mode operation is used for high density and time-vs-flux change measurementt such as when the flux level at a specific LPRM (A, B, C, SML 252F 30 Rev. 6

t,

.e or D) or axial location must be determined.

The manual mode is.also suggested whan'

-l traversing the common channel (10) at core l

location 28-29 to enable longer runs.

i

~

Manual Drive'(Consult OP-09.1 for specific l

c.

l precautions and instructions).

(1)

Used to probe guide tube runs to.

determine core-top limits.

,(2)

Drive chain from drive mechanism gear head to mechanical slip clutch ~must be removed.

(3)

Manual valve control switch on the drive i

control unit must be at open to open ball valve.

(4)

Detector is moved by attaching a hand crank to the load shaft.

t d.

TIP Purge Operation (Consult OP-09.1 for j

specific instructions).

I (1)

Uses nitrogen from the containment atmosphere control system.

i (2)

Complete valve line-up per OP-09.1.

(3)

Check for proper pressure and flow.

Abnormal Onerational Relationshins 2.

Abnormal operation conditions may be a.

experienced as follows:

(1)

TIP detector cannot be retracted and/or SML Rev. 6 31 252F

~

i

.i

)

6 (2)

Ball valve will not close, and

{

(3)

Definite indication that guide tube is i

defective and leaking (4)

Group 2 isolation required but detector l

does not retract and ball valve does not close.

l Given the need to isolate the guide tube the shear valve shall be closed by operating the key lock switch (S-1) at the valve control Monitor.

b.

Operators need to be aware that a Technical Specification LCO needs to be initiated if either of the following conditions occurs:

(1)

The TIP detector is inserted beyond the ball valve and that TIP machine power is turned off.

The TIP logic is defeated in this condition and a Group 2 isolation signal will not occur on this TIP probe.

(2)

A TIP detector becomes stuck beyond the ball valve.

Technical Specification does not list the shear valve as a backup to the ball valve so an LCO is SML 252F 32 Rev. 6

s needed whether the shear valve is closed or not.

3.

Relationshins With Other Syst===

l a.

Local Power Range' Monitoring System

~

(1)

The TIP's are used primarily to calibrate LPRM's.

(2)

LPRM's must be recalibrated at the following times:

(a)

At each testing plateau during startup testing.

(b)

Every full power month to recover sensitivity lost due to detector fuel depletion.

(c)

When control rod sequence is exchanged from A to B or back.

(d)

When operating mode has changed significantly.

An example would be the loss of a heater string which l

would cause an increase in Base l

Crit Codes which indicate that the computer is unable to derive a gain factor value for LPRM's from the last TIP normalization data that compares favorably to heat balance core power.

(e)

After refueling when usually a SML 252F 33 Rev. 6

r number of LPRM's have been replaced

{

or the core has been altered and-radial and axial profiles have been changed: also when two months have j

i usually elapsed and electronic circuits should be checked prior to j

power range operation.

b.

Process Computer.

l (1)

At equilibrium xenon and steady state r

I power, TIP scans are performed according to the procedure for on-demand function-01 of the process computer.

l t

(2)

The computer compares the TIP data to f

i present LPRM readings.

(3)

The computer calculates gain adjustment l

}

factors that will make the LPRM's agree with the TIP data.

Electrical supplies c.

(1) 120 VAC Instrument and Control (Panel l

i 1AB)

(2) 125 VDC System (Panel 4AB)

(

(3) 480 VAC for Drive Motors (MCC 2XL and i

2XM)

I d.

Nitrogen Purge - from inerting makeup supply line.

l e.

Control Air Purge I

SNL Rev. 6 i

34 252F

i t

i

}

4.

f f.

Group _2 Isolation (1)

Initiated-by Group 2 Isolation signals (a)

Low Reactor Water Level 162.5" (b)

Hi Drywell Pressure 2.0 psig

~

(2)

On this signal, any TIP not in the i

shield chamber is automatically j

transferred to the manual reverse mode i

l of operation (Result of relay logic in drive control unit).- When the detector j

is In-Shield as indicated by the limit i

i switch the ball valve is closed.

Y.

SYSTEM PROCEDURES A.

OP-09.1 TIP Onaratincr Proceduras, Traversing In-Core-

[

Probe System, provides specific precautions, initial conditions, and operating instructions for the operation of the TIP system automatically or manually, including operation of.the purge system.

B.

AOP-05.2 Hi Radiation in Occunied Area, Abnormal Radiation Level in Occupied Space, should be referred to if the withdraw limit switch fails.and the detector withdraws past the shield.

SML 252F 35 Rev. 6

I RECORD OF REVISION PAGE REV.

REASON COMMENT REV.

DATE REVISED NUMBER COMMENTS i

1 3/86 11 1

Minor corrections.

2 3/87 11 1

Expand objectives.

3 3/88 11 1

Expand operations, combine RO/SRO material.

4 2/89 11 1

Add INPO Tasks.

Revise objectives.

5 4/89 11 1

Replace objectives.

6 4/90 11 1

Replace objectives.

REASON REVISED:

Enter the number or numbers corresponding to reason revised in the Reason Revised column and brief description of changes in Comments column.

Comments are to be numbered consecutively in each revision.

1.

Vendor Reference Document Technical Upgrade.

2.

Plant Modification (indicate number in Comments) 3.

Procedure Upgrade 4.

QA/QC (indicate NCR number in comments, as applicable) 5.

Single Point Failure Analysis 6.

PNSC (indicate action item number in Comments) 7.

Temporary Revision 8.

Plant Operating Manual Upgrade 9.

Regulatory Commitment (indicate IER/OER/LER, etc., numbers in Comments) 10.

Technical Specification (indicate Technical Specification Amendment No. in Comments) 11.

Other (explain in Comments) 1 SML 252F 36 Rev. 6

7 4

9 FIGURE 1 TIP BLOCK DIAGRAM

~

r

~

f KEACTOR CORE g

CROSS CAllBRATION I

l

_ _ _ d __ uECHANim INDEXING g

CONTAINWEN T l

CONTAINMENT PENETRATION r

PENETRATION _

l I

6 BALL ygtyg

- % VALVE L

- 4 P!'l TO PURCE SYSTEM I

n-l I

CHAMRER l

4 3HIELD r

l l

I I

.ECs.

i F-i L_ _ _

_ _._i.__ _

J t

ELECTRICAL $1CNALS

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ue m.

m.d.

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FIGURE 2 TIP DRIVE MECHANISM i

?

e Taste WP RSEL OETECTOR y WGSOEA A007CDuerTem I

/ N" f au'" ="

l q.

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FIGURE 4 GLEASON TAKE UP REEL ASSEMBLY i

trapsars CASLSOmsvt

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FIGURE 7 TIP SHEAR VALVE 4

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LPRM STRING ASSIGNMENT TO. TIP. M ACHINES FIGURE 14 CORE TOP VIEW f

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'r.LECOPY OPERATOR REMARKS:

IF YOU n!n 407 RECEIVE ALL TN( PAGE$, PLEAst TELEPHONE AS 500M As POSSIBLE.

ASEA Cor,: ".19) 457 3601 MA VE A ___ S PA F F FO-800 TEt.ECOP1ER MUMMEa:

( ARE A C00E 9],9,) 4p. ;b 29

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UNP Ul2 REC!!it IPN : I! 1NG DC II IL, i.h 3

Survey 1989 1989 I?S9 1989 1%

1990 Percent F-4 Point Pre-decon Pre-decon Post decon Post-decon Current

. urrent Increase Int. we location No.

Contact G/A

' 'ontact G/A Contact G/A Contact G/A e

F Raser 12 inch 38 Ft Elev i

180 80

!.5 15 1000 400 6667 2667 8

G Rizr 12 Inch 38 Ft Elev 2

160 70 9

5 8 75 375 9722 7500 1

H Riser 12 Inch 38 Ft Elev 3

170 90 7

5 6?S 325 8929 6500 JRiwr ch 38 Ft Elev 4

150 75 8

4 1*i 500 13750 12500 K Riser,

ch 38 Ft Elev 5

XI 90 9

11 w

400 10278 3636 B Loop End Cap 22 Inch Manifold 6

120 50 11 5

200 100 1818 2000 m

B Loop Cross 22 Inch Manifold 7

30 30 5

5 450 400 9000 8000 B Loop 22 Inch Manifold @F043B 8

100 20 30 25 500 325 1667 1300 Vcrtical28B Discharge 17 FT El 9

500 300 55 40 500 325 909 813 3

o Elbow 28B Discharge 5 Ft Elev 10 100 90 25 20 350 350 1400 1750

}

B Imop 4 Inch Bypass Ii 100 85 30 25 1100 450 3667 1800 B Purnp Discharge 12 20 15 60 35 200 175 333 500 8

Elbow to Pump 28B Suction 13 120 140 40 35 450 300 1125 857 o

A Riser 12 Inch 38 Ft Elev 14 150 80 5

5 1150 500 23000 10000 B Riser 12 Inch 38 Ft Elev 15 200 75 4

4 500 250 12500 6250 z

C Riser 12 Incn 38 Ft E!cv 16 250 75 5

5 1200 550 24000 11000 m

D Rise:

h 38 Ft Elev 17 300 90 4

4 950 475 23750 11875 E Riser. b:A 38 Ft Elev 18 250 85 5

5 1100 550 22000 11000 A Loop End Cap 22 Inch Manifold 19 180 70 35 12 200 150 571 1250 A Loop Cross 22 Inch Manifokt 20 30 30 5

5 350 300 7000 6000 A trup 22 Inch Manifold @F043A 21 90 60 18 18 650 400 3611 2222 Vertical 28A Discharge 17 Ft Elev 22 150 10 60 60 500 375 833 625 Eik,w 28A Discharge 5 Ft Elev 23 120 65 18 18 450 325 2500 1806 n Iu.; 4 Inch Bypass 24 110 411 40 20 1500 550 3750 2750 p Discharge 25 80 65 40 35 300 200 750 5 71 hiww to Pump 28A Suction 20 140 120 70 45 500 400 714 889 Average 154 82 24 18 678 363 7471 4464 7

Notes: All readingd in mR/hr 9

N O/A taken at 18 inchc..

BRUNSWICK NLJC:_ EAR PROJECT 4

UNIT TWO REClRCULATION SYSTEM j

AVERAGE DOSE RATES i

mR/hr 2

700 e

600

'l 500

\\

3

=

400 a

300 S

sq o

200 l.

$, %-j,...- j i

gt 1985 1986(1) 1987 1988 1989(2) 1989(3) 1990 YEAR I

IGENERAL AREA CONTACT (1) POST-CHEM DECON (2) PRE-CHEt/ DECON (3) POST-CHEM DECON

($

1

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Cpal Carchna Power & Light Cornpany dM[k[N5 Camoc.y ceriespor.o ne.

Brunswick Nuclear Project

,KI 21 :!N1 e

September 10, 1990 4

d MEMOP.Mr "M TO:

Filo FROM:

R. B. Starkey, Jr.

SUDJECT:

l'iupesition of Gamma TIP Exposu4s Event Concerns l

I Raised 4y Larry Dew

REFERENCE:

1.

Monorandum to Ruos Starkey from Lar; Dew dated July 30,

1990,

Subject:

Gam;ta TIP Exposure Event 2.

Plant Incident Report Number 90-044, titled

" Gamma Tip

'D' Rotracted to Drive Box" 3.

Human Performanco Evaluation System (HPES),

?

HPES Evaluation Number 90-17, titled " Gamma Tip

'D' Rotracted into Drive Bcx" i

4.

Environmental and Radiation Control (E&RC)

Experience Report Number 90-004.

The Reference 1 event descriptions provided by Larry Dew were compared with those contained within the Reference 2,

3,

& 4 ecports.

Four event differences appear and are listed below.

A.

Doth the Plant Incident Report (Reference 2) and the HPES Fvaluation (Reference 3) indicate that Larry Dew provided some assistance in cranking the TIP while working TIP

'C'.

Larry Dew w s indicated within Reference 1 that his involvement with cranking a TIP began with TIP

'D8 PE5PONSE:

A review of the Reference 2, 3,

& 4 reports indicab that the significance of whether Larry Dew did ot not crank TIP

'C' was such that it would not av di altered the root

causes, corrective actfon or conclusions reached within the reports.

T h e r : n o r,o n s e d reports based the participation by Larry Dev

'n the cranking of TIP

'C' on information obtainec

. rough interviews with personnel involved with the pr>

o-t.

i i

2 B.

Both the Plant Incident Report (Reference 2) and the HPES Evaluation (Reference 3) indicate that Larry Dew grasped the drive cable approximately one foot behind the TIP

'D' detector when inserting the detector into the drive gear.

Larry Dew has indicated within Reference 1 that at the time of the mock-up he was able to determine the distance as 6 to 7 inches.

RESPONSE

In determining the radiation exposure, and based on the mock-up results, the distance of 7 inches from the TIP l

as the point the cable was grsbbed was used within l

Reference 4.

l C.

Neither the plant Incident Report (Reference 2), the HPES f

Evaluation (Referenco 3),

or the E&RC Experience Report l

(Reference 4), indicate that Larry Dew grabbed the TIP

'D' at any time during the event.

Larry Dew stated within Reference 1 that he had grabbed the TIP when it started over the top of the reel.

RESPO:m::

In the interview with Larry Dew on the day of the event, he stated he had grabbed the drive cable approximately 12 inchos behind the TIP.

No mention of grabbing the TIP was made.

In addition, he signed a statement dated July 5, 1990, which contained the following statements, "The next thing I knew the TIP came out.

I grabbed the cable and shoved it back in."

On 7/9/90, at the mock-up, Larry Dew re-enacted the event several times.

Each time he grabbed the drive cable at a distance which averages 7 inches from the TIP.

No mention of grabbing the TIP during the re-enactment was made.

On 7/10/90, Larry Dew contacted E&RC and indicated he may have grabbed the TIP during the event.

He stated "I can't say I did not do it."

Based on the fact that grabbing the TIP was not mentioned immediately following the event, or during the mock-up re-enactment, and coupled with an uncertain response on 7/10/90, the conclusion in the Reference 2, 3, and 4 reports was that the TIP was not grabbed at any time during the event.

D.

In making the radiological determination of exposure, thn critical parameter of the tine the TIP was in the core was determined to be three minutes.

Larry Dow has indicated within Ref~orence I that the time was 8 to 12 minutes.

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3

RESPONSE

The TIP and approximately 12 feet of cable are in the core when inserting the TIP into the core.

When cranking, you would expect to be inserting the TIP into the core at approximately 1 root per second.

Thus, 12 1

seconds into the core and 12 secondu to remove it from the core.

Based on E&RC interviews with the Lead CP&L I&C Technician, who was at the scene during the event, a 3-minute time period was determined to be the time the TIP was actually in the core fer the needed adjustments.

This Lead Technician was knowledgeable and experienced with the TIP system and was considered to be the person in the best position to make the determination.

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